To learn electronics in a very different and effective way, and gain access to Mr Carlson's personal designs and inventions, visit the Mr Carlson's Lab Patreon page here: www.patreon.com/MrCarlsonsLab
Truth be told! You might not realize it yet and I'm calling it, you will be remembered throughout all time for the work that you are doing here! Your name will be just as synonyms as Einstein and Newtown are in their own fields of interest. My family alone knows you on first name basis! And they have never watched a single video of your work! After each video, I'm walking around the house saying Paul Carlson this and that! You have essentially become a household name in my house LoL... The trouble with humanity is that it takes too long for humans to recognise excellence and give recognition to where it's deserved most! This is Nobel prize winning stuff right here and instead we give it to people who think they have discovered Quark's? I don't know what you do when you are not working on these videos but I wish that I could help you to continue your work but unfortunately I'm not in any financial position to do anything about it at this point of time. I like a lot of other people are addicted to your channel and can't wait till the next one arrives... Thanks for everything you do!
Kind of OT. I am deaf. I hear only with the help of a cochlear implant and it's not a 100% thing. I wanted to let you know from my standpoint how appreciative I am of how clear your speech is. The moderate speed and great annunciation is so wonderful. Together with the excellent audio quality of your vids, I can give you a "599" report and relax, listening without the closed captioning. No one who is not deaf could ever comprehend how this little detail makes the world of difference to me. Many thanks, M.C. - Tom
I can still hear my Lab Chief back in the 90s: “Turn down the intensity, you’re going to burn the phosphor!” Of course none of us technicians ever did.
Hi Marc. Ya, this one was in nice condition. I have another one with "poop" still on the case from a barn. I didn't want to bring that onto the lab bench, LOL! I look forward to your next video!
I love finding that one of my favorite RUclipsrs has commented on another of my favorite RUclipsr's video lol. Love both channels and can't wait for the next videos!
@@MrCarlsonsLab It could be worse. As a Navy Electronics Technician at the Midway Island Communications unit, I got a part time job in the Navy Exchange TV/Radio repair shop. A regular shop that repaired consumer electronics sold in the Navy Exchange store or anything else people brought in. The guy in charge was a GCA technician (Ground Control Approach). Along with the spray cans of tuner cleaner and freeze spray was a can of Raid. I asked why. He said to just wait and see. One day one of those 5 tube plastic kitchen radios came in, covered in kitchen grease, and when we opened it, roaches emerged and started scampering about. THAT is what the Raid was for.
Never gets old watching these things come back into service. That scope in particular would be an awesome teaching tool as well. No "Auto" button here! 👍
So excited! I've been checking back almost daily for the past two weeks for the next video. Your content is excellent and very, very appreciated. Thank you for everything you do to further the industry and to give back to those who are just beginning/tinkering.
As someone who knew little and less about electronics, I love watching your videos - thank you so much! And I love looking at all the old electronic equipment too!
1930. 91 years old and...(even if serviced in 47, one month before the birth of my Dad lol) and it's working !!! Surely they knew how to design and build things back in the day !!!!! Another great video Paul, so perfect and inspiring to start my electronic week 😁
I love the way you describe things in a way anyone can understand. I love your videos. It's like listening to my mentor back when I did my apprenticeship 30 years ago
Great video on a great channel!! I just discovered you about 3 weeks ago. I've binge watched about 20 videos on a 50" TV screen. My wife calls you the "boring capacitor man", but I Love it!!! I was a Navy Radar Technician in the mid 1960s and post Navy, worked as a computer engineer for RCA (at Harrison, NJ) , Univac, and finally GE. Although I retired 21-years ago from GE, and am now in my 70s, your youtube channel has awakened a desire to restore some old vacuum tube test equipment...... As a young boy I used to play in the woods behind the Allen B. Dumont Labs on Bloomfield Ave in Clifton/Passaic, NJ. and today's video really hit home!!! BTW. Allen B Dumont, in 1932 in NJ was the inventor of the 'Magic Eye Tube' as well as a pioneer in Radar. Keep up the good work, I'll be binge-ing on more videos in the coming weeks. Bob
When a teenager I mistakenly touched the capacitor on top on one of those old globe tube radios. The older the radio looked the more I wanted it. My bedroom had a bunch of old time radio circuit boards. Some would run but others not. The capacitor shook the muscle on the back of my arms. This was in the early 60's. Wish I had those radios today.
All that history...great project. I was an Electronic Engineer for 18 years in England. I really enjoy watching your methodical approach to your fault finding. Reminds me of me 😂
That's awesome. I just bought an old Hameg HM 112 / 312-6 scope , replaced all caps, repaired some small defects and it's working! Great machine from 1976.
Watch makers/repair put papers inside the watch cases with dates of cleaning or repairs. Later they scratched the same info onto the inside of the watch cases. Looking forward to this rebuild, Paul.
Great motto - "If it's dead when it comes, it lives when it leaves!" Wish I'd thought of it back when I was fixin' for a livin'. Hope to build your capacitor checker soon. Thanks for the fine presentations!
I bought one of these in an antique mart in Florida maybe a decade ago. Hooked a wire to the back allowing it to trace, and it worked with no effort. Sold it off on eBay for about what I bought it for, as to not collect too many items. Regret selling that one ... was an interesting find.
Makes me wish I knew what I was looking at as a kid when my dad was repairing TV's and VCR's. So much vintage stuff came through our house and I thought the tubes, nixie's, bulbs, etc were so cool, but I was only like 8- 10 years old... I'd walk around flea markets with him and there were a few gear sellers also slinging "outdated" repair gear.
Thank you! I always enjoy your chats. I was lucky enough to have a dad, who would build Heathkits to get equipment. I got involved as the oldest. One voltmeter - swipe dial - tube I think was my go to as I learned. Switch circuits and voltage scale, were easy to see and understand. A full scale would only tap the needle. These last 20 or 30 yrs with the DMM's. Most do not understand that the time delay to read the issue may fry the boards inside before you ever know to stop. Looking forward to the build! Cheers Mr C.
This piece was clearly loved through it's time. -GOOD! It's supposed should be like that. :D Thank you much for showing the story. The history is part of it...and that old flux. Can't get that enough of that... So clean! Beautiful. Thank you Mr. Carlson!
Each time I watch one of your videos, I'm always very impressed with the expression of your knowledge and skill. It has obviously taken you many years to acquire this. Keep up the good work.
17:06 that is precisely why I go for older stuff whenever it's practical for me to do so. For all its inefficiencies and bulkiness the old stuff will just never die. It will usually still function and even if it's malfunctioning it can be easily and quickly repaired, unlike modern stuff that's just 'discard and replace'. My electricity is hydroelectric/nuclear anyway so I don't have carbon worries either. Win Win really.
Just wanted to echo all of the positive accolades of fellow followers and add that I love your pride in craftsmanship attitude that you impart. It's refreshing to see no matter what vocation it's coming from. Thanks!
My Dad had one of these and I still have it. Growing up my Dad used to work on all types of electronic equipment down our basement. Car radio's, tabletop radio's, phonograph, TV's etc. I used to watch him and learned how to repair everything at 7 years-old and now I am 58 years-old.
Hi Mr Carlson's Lab Inspirational. Due to your videos and a bit of lock down (sigh) in the last 6 months. You have inspired me to pick up my electronics and start doing electronics again. The result is repaired 1 battery radio receiver. 3 mains valve radios, 1 solid state transceiver and assorted other electronics on the shelf to be worked on. Purchased 1 de-soldering machine, how on earth did I ever manage without one of these. In the last month decided to get my HAM radio exams out of the way. Then I will be off to Patreon, I must have one of your capacitor testers and your no contact probe, that will save a lot of time. Sincere thanks to your self and your brilliant videos. Oh and in reference to one of your older videos, hysteresis (his-ter-ee-sis)
Great video! Your name was mentioned by Grant Wyness on soldering smds. He spoke very highly of you and your capacitor tester! I also saw your name mentioned on Antique electronic supplies website. (positively) Thank you for all your service and thank you. I will look into building one of these in the future. Good luck. I can't wait for a follow up on this!
It's nice to see some of these things in person. I worked for an electronics supply company about 30 years ago and it was my job to look through schematic books and find part numbers for people and either find them in stock or order them for customers. SO I've had extensive use of schematics. We also sold the schematics to a lot of old electronics.
Holy cow! 80 years old and that thing still has sync. That's amazing. The oldest I've ever used was what my engineering professors called "Stanley Steamer" Textronics scopes on those big carts that we still used in our college labs in the 80's.
I am glad you posted a new video, I was watching old reruns of yours from 5 years ago while waiting for a new one. Good to see you are still bringing these old marvels back to life!
Dumont goes way back, I used to work on some of the TV's they made and they were built like tanks! I have an old Eico scope and is similar to this one. I haven't used it for a while and this gave me the want to get it out and see if it still works . I recapped it back in the early 2000's and it was a good general purpose scope!
Paul, As always, another excellent video from you! I always appreciate the thoroughness with which you go through the details of all the important things that need to be considered and aware of in working with the older vacuum tube equipment. I also am amazed at how well this thing worked without doing anything to it. The thinness of the line, the brightness of the CRT, other than the bent chassis and the discoloration and missing handle on the outside, this rig is in amazingly fine shape. Really looking forward to the restoration on this one...and also eager to see more on the BC348 receiver!!!
Excellent educative video as always. One question: When you hooked up the signal generator it looks like the scope is not sweeping the horizontal linearly. Is that correct and how they worked?
Yes, much of the time, the sweep linearity produced a trace that looked somewhat squished at one end. Very common with older scopes. Thanks for your kind comment too!
@@greggoog7559 Yes, I've seen several scopes from this era that had this behaviour, including one we had at school back in the 70s! If you look in radio magazines from the 40s "linear sweep" is advertised as a feature on some scopes!
Hi Paul - I too am amazed at how many ancient items (un-messed with) actually 'live' ! Love that old Dumont 'scope. I have a WW-II A.C.Cossor Mod: 3339 'scope + a later Philips Mod: 5655 which still work o-kay, probably a few leaky caps to replace by now, I imagine. Thanks for the insightful video. - Best 73, de Tony in S-Africa...
Oh man! I love this scope! And you are more than right - there is so much successful and meaningful work one can do today with it, most people just don't imagine. Not having a calibrated grid and sweep, nor markers, does not rob you of the capability to "see" the voltage. Anyway, these days its not hard at all to give this scope a small companion - a time and voltage calibration box, which would allow one to calibrate the screen before measuring. Great piece, and I cannot wait to see it shine after your hands do their magic. All the best! Bill
Given as a gift. A Toledo duck crystal radio w/ Sylvania diode along side a Galina diode. It's 100 years old and used it to listen to a foot ball game recent. The ham was very elderly. And asked me to take care of his "rig" in the mid 90s. It's now 2021 and still running. To day. De kv4li 73
I am building your test tools, and conserving / upgrading vintage British equipment. E.G. Cossor 1039M or CT52 miniature O'scopes. I find that some upgrades are required in order to make them useful for low voltage testing: swap the Y amplifier valve for a more modern high slope RF Pentode to increase gain and bandwidth: remove diode valves and selenium diodes and replace with silicon, then adjust load resistors to compensate for the changed voltage: add a sync amplifier: add a HT surge suppressor to keep HT voltage under 400 V. Or alternatively make any power switch on the instrument switch HT on/off to permit first powering the valve heaters when powering from the mains.
There are chances that making some wav files of the initial "Hi everyone and welcome to another episode of Mr. Carlson's Lab" from some different videos they can be binary matched. Love it. Thanks Paul, I'm learning a lot from your videos, here and from Patreon. My lab is growing well thank to your inventions. Great respect! (Sorry for english mistakes, if any). Go, go, go!!!
Hi Paul, I understand the underpinning theme of your channel is to present restorations of various devices and occasionally a project or a product review. They’re always interesting and extremely informative. I and I expect a large number of other viewers would like to hear your views on newer inexpensive oscilloscopes and if possible a review and a recommendation. My personal interest is in the area of audio equipment. Thanks Mark
Very clean and unmolested inside, great to see. I was pleasantly surprised to see it fire up and function. Not only built to last (a bit cliche) but built to be serviceable - even if that's on the kitchen table.
Gene it’s really great you are on the internet, your generation is underrepresented online, and like so many things taken for granted - once it’s gone it’s gone.
Good afternoon Mister Marvelous item !!! and fantastic construction !!! what the difference with today .... Good job and explications thanks for the share Eric from France
To Carlson I was watching your video about your restoration on 1938 De forest 7D832 radio it was very interesting the radio is handsome I am a collector of pre-war radio’s one of my favourites is a pye type mm made in the early 1930s that Cambridge in the uk . We had one in school . My mother use to work at pye
Paul... great video as usual! The oscillograph got me interested, so I looked up the Wikipedia article on Allen DuMont, and it said that he was a very important figure In the development of CRTs and television and even invented the eye tube. He did all that here in northern NJ. Thanks again for the great content!
Re old equipment: I can't tell you how many times I've found it was operator error. I started a new job in 1997 and as I was being shown around for the first time, the guy I was replacing mentioned, "oh, that's broken, that doesn't work... been meaning to send that out for repair, etc" to at least 10 different pieces of gear. In the months that followed I could not find one piece of equipment that was damaged or defective in the slightest. It was all operator error by a guy who just never bothered trying to find out how to work the gear in the first place.
The construction is very well done. Looks like other than the bent chassis this was well taken care of. Absolutely love the historic pencil markings. Folks you gotta give yourself the Carlson Edge!
Mr. Carlson, thank you. Your videos are very good. I have broadened my know of electronics far beyond my experience. Please consider a video on your historical back ground. Are you self taught. How did you begin learning electronics. Your presentation is very practical and unambiguous. Peter M.
Thanks to your channel here I just picked up a 500 series tektronix scope in a local ad.. Partially working, Cant wait to get into it.. I have other test equip but need a variac next.
Hi! As always, great video! For the next video, could you present the restoration and alignment of a 1940-1950s Zenith TransOceanic AM/Shortwave radio? My dad brought one home after the war and I want to learn how to fully restore it! Thanks for all you do to advance electronics and repairs!
Enjoyed your presentation. I used to have the same scope, but the power transformer went bad in it. Which reminded me: In 1933 the line voltage was 110vac. Today the line voltage is usually a bold 120vac. (a "bucking" transformer) is a good idea when using these older electronic devices.
to see the hand writing the same in the writing of repair dates from the 40s to the 60s shows it was the same prepair person or owner.. crazy to think about
Hey Paul. You almost seemed disappointed it worked as well as it did😉... definitely back then things were built to last. Looking forward for the next one! Take care too. Cheers
I have a 1956 Hickok 195A which is the second upgrade to the 195 as you stated. Has a 5UP1 CRT, kind of emotionally attached to it since my grandfather gave it to me as I got started in electronics as a hobby in 1972. Took it out of use since the across the line paper wax 0.1 uF 400v capacitors were getting hot, before they pop. This video is getting me motivated to get some modern safety capacitors ordered from Mouser and get it fired up again. Could just clip them out for now just to do an assessment I suppose.
Just signed up to your Patreon, worth it just to get the schematic for your capacitor leakage tester! Been watching your videos for a while now, I've been into electronics for as long as I could walk & talk, and indeed it's my job as a repair guy at a DJ shop, but watching these videos I realise just how many gaps there are in my knowledge. You'll post a new video, and I'm thinking "ahh, so THAT'S how that works. How did I get this far without knowing that?" :) Keep up the good work sir.
If you had a version of that capacitor tester that used vacuum tubes I would probably build it myself. And probably jump on the patreon specifically to get the schematic for it.
Dear Mr. Carlson, It's been maybe a year since I last contacted you. I have this antique Delco radio which I inherited from my grandmother, and I decided to try repairing it as per your videos. I removed the BED resistors and the waxy caps. I also disconnected the tower cap and replaced it with equivalent new 10uF electrolytic caps. The good news, I was able to find some poly caps which I used in place of the waxy ones, and I was able to locate the shielded ends of the caps. I took a whole lot of pictures and used them to determine where to connect new resistors and the new caps (Allen-Bradley resistors are so hard to come by that I had to make do with film resistors, instead). I replaced the unpolarized power cable with a reproduction cloth cable, making sure that the switched end was the hot lead. I was able to get it to power up (I built my own light bulb iso transformer variac kit current limiter to make sure that the radio wouldn't catch fire had it been shorted). One of the waxy caps was connected between AC power and chassis ground, and so I replaced it with one of those blue safety ceramic disc caps, making sure it was connected to AC neutral (the schematics call for it to be connected to AC switched which means to me that AC hot would be unswitched and AC neutral switched, which I think is dangerous). Its "antenna" was just two cloth leads, all old and torn, and so, based on what I saw on some of your videos on the backs of all-American radios, I took one hundred feet of solid wire and made an antenna board out of a scrap piece of perforated pegboard, in which I spiraled the wire around about twelve times and put two more of those safety caps on each end of the wire (every RUclips video from anybody shows how to make a /parasitic/ AC antenna rather than a /connected/ one, and so I had to guess). The pegboard also provides ventilation for the vacuum tubes while keeping curious fingers away from the tubes and chassis (it originally was open backed). Now, the bad news. I tested the radio and it makes not a sound. Not even a hiss, crackle, or hum. Nothing. So, knowing that you know more about antique electronics than I do, I would like to deliver it to your shop for repairs. I live in Los Angeles, CA, which I know is far away from Canada, but I don't know who else to contact. Please give me your business mailing address, and I will deliver it there.
You know, when you get one of those ah ha moments! EPR! Duh! It seems that I have always had a quasi understanding of capacitor failure modes! Apart from a shorted capacitor, DC leakage was the other and possibly the main reason why equipment fails! I have always been concerned with capacitor leakage but I still see plenty of people on RUclips that will simply put an ESR meter across the capacitor and say, oh! It's still good and yet it's capacity is making it look like an overachiever! This to me screams a problem with EPR, due to the DC leakage it's taking longer to charge the capacitor giving the impression that it now mysteriously has created more capacity in its current space time relationship LoL... No! It's bad and it has to go! Having extra DC on top of an AC signal will saturate the next component in line, it only takes a tiny bit of DC on top of AC for this effect to occur. I have read an article from the early years and they were well aware of this issue back then, the article was about how manufacturers of TV's wanted to ditch the power transformer and just go with half wave rectified supply but Australia blocked it because the electrical system used the galvanized plumbing as the neutral and the pipes would corrode in 3 months... So basically, it's not a new problem, it's been around for a very long time, and the lack of understanding of the problem is still with us today... Maybe you should put your marvelous LCR Bridge into the spotlight alongside your EPR meter and show people what you really mean about EPR... Besides, I'm dying to see it being used! I never knew that such a device existed and it's been right there hiding behind you! Maybe we can get to see it in action in the restoration video? (Please 🙏)
Paul, are you going to share the diagnosis of the sweep circuit, and ultimate repair of same? Would love to watch along. I have the Laboratory model of that unit, with the mammoth power supply that sits below the scope and control unit, this video has been very helpful! Thanks a million!!
speaking of basic test equipment there was a guy that used perfect pitch to trouble-shoot devices, the one day he got an oscilloscope, Mmm great video MrC...:) 👍👍
Many many years ago, I threw together a Heathkit oscilloscope. However, it came with a solder supply, but whatever it was, it did not have the usual flux. Whatever it had, it literally ate away the PCB's, each beyond repair. Years later, I threw together a Heathkit Hero 2000. This time I used my own supply of solder. My 1986 Hero 2000 is still working to this day. Although there was a flaw in the motor control board. When in sleep mode, the main +5Vdc was shut down, but a sleep mode +5 Vdc was still active for basic functions. But that sleep mode +5 Vdc was not connected to all of the the motor control board IC's. So the IC's that were used to connect the motors to +12 Vdc and GND or vice versa, to determine the direction each motor was running, now had no +5 Vdc supply. But they worked, most of the time. The signals fed to these IC's had now become the power supply by providing current to the IC through the input protection diodes. But when it failed, the whole motor control board went up in smoke due to the +12 Vdc line now being connected to the GND, rather the path being through a motor. I managed to fix the board by replacing the damaged parts, twice.Once finding the cause of all this, I informed Heathkit of this problem, and so they kindly sent me a new assembled motor control board, for free.
![Blox Fruits Dragon Rework Update [Full Stream]](http://i.ytimg.com/vi/EqDAp8udhm0/mqdefault.jpg)
To learn electronics in a very different and effective way, and gain access to Mr Carlson's personal designs and inventions, visit the Mr Carlson's Lab Patreon page here: www.patreon.com/MrCarlsonsLab
You finally convinced me just signed up and look forward to learning. even more! thanks.
@@ve3dvy Welcome aboard David!
Same here, I’m signing up and doing the $20/mo, I could use the help on a couple projects.
Truth be told! You might not realize it yet and I'm calling it, you will be remembered throughout all time for the work that you are doing here! Your name will be just as synonyms as Einstein and Newtown are in their own fields of interest.
My family alone knows you on first name basis! And they have never watched a single video of your work!
After each video, I'm walking around the house saying Paul Carlson this and that! You have essentially become a household name in my house LoL... The trouble with humanity is that it takes too long for humans to recognise excellence and give recognition to where it's deserved most! This is Nobel prize winning stuff right here and instead we give it to people who think they have discovered Quark's?
I don't know what you do when you are not working on these videos but I wish that I could help you to continue your work but unfortunately I'm not in any financial position to do anything about it at this point of time. I like a lot of other people are addicted to your channel and can't wait till the next one arrives...
Thanks for everything you do!
signed up for patreon some months ago now, well worth the money of my daily coffee. A no brainer for such awesome content!
Kind of OT. I am deaf. I hear only with the help of a cochlear implant and it's not a 100% thing. I wanted to let you know from my standpoint how appreciative I am of how clear your speech is. The moderate speed and great annunciation is so wonderful. Together with the excellent audio quality of your vids, I can give you a "599" report and relax, listening without the closed captioning. No one who is not deaf could ever comprehend how this little detail makes the world of difference to me. Many thanks, M.C. - Tom
Thank You for your kind feedback Tom!
I can still hear my Lab Chief back in the 90s: “Turn down the intensity, you’re going to burn the phosphor!” Of course none of us technicians ever did.
Yes!!! It was "a must" in every lab session we had ...and sometimes we got a fine because we forgot to keep the brigth low
You are what they call "a Legend of youtube"
bro keep up the amazing content!
From South Africa
i love that Mr Carlson is doing his best to pass his knowledge to future generations to keep this tech alive. keep up the good work
“It lives when it leaves”
You have the name of your auto-biography.
Or a new horror movie, one or the other.
Nice! This is in such beautiful shape! You’d ne er think it is that old.
Hi Marc. Ya, this one was in nice condition. I have another one with "poop" still on the case from a barn. I didn't want to bring that onto the lab bench, LOL! I look forward to your next video!
I love finding that one of my favorite RUclipsrs has commented on another of my favorite RUclipsr's video lol. Love both channels and can't wait for the next videos!
@@aaronjamt same
@@MrCarlsonsLab It could be worse. As a Navy Electronics Technician at the Midway Island Communications unit, I got a part time job in the Navy Exchange TV/Radio repair shop. A regular shop that repaired consumer electronics sold in the Navy Exchange store or anything else people brought in. The guy in charge was a GCA technician (Ground Control Approach). Along with the spray cans of tuner cleaner and freeze spray was a can of Raid. I asked why. He said to just wait and see. One day one of those 5 tube plastic kitchen radios came in, covered in kitchen grease, and when we opened it, roaches emerged and started scampering about. THAT is what the Raid was for.
My dad had one of those and I'm almost 70....
Never gets old watching these things come back into service. That scope in particular would be an awesome teaching tool as well. No "Auto" button here! 👍
And it's beautiful, seriously, analog electronics were happy to show off what they were
So excited! I've been checking back almost daily for the past two weeks for the next video. Your content is excellent and very, very appreciated. Thank you for everything you do to further the industry and to give back to those who are just beginning/tinkering.
As someone who knew little and less about electronics, I love watching your videos - thank you so much! And I love looking at all the old electronic equipment too!
Thanks for watching!
1930. 91 years old and...(even if serviced in 47, one month before the birth of my Dad lol) and it's working !!! Surely they knew how to design and build things back in the day !!!!! Another great video Paul, so perfect and inspiring to start my electronic week 😁
I love the way you describe things in a way anyone can understand.
I love your videos. It's like listening to my mentor back when I did my apprenticeship 30 years ago
Great video on a great channel!! I just discovered you about 3 weeks ago. I've binge watched about 20 videos on a 50" TV screen. My wife calls you the "boring capacitor man", but I Love it!!! I was a Navy Radar Technician in the mid 1960s and post Navy, worked as a computer engineer for RCA (at Harrison, NJ) , Univac, and finally GE. Although I retired 21-years ago from GE, and am now in my 70s, your youtube channel has awakened a desire to restore some old vacuum tube test equipment......
As a young boy I used to play in the woods behind the Allen B. Dumont Labs on Bloomfield Ave in Clifton/Passaic, NJ. and today's video really hit home!!!
BTW. Allen B Dumont, in 1932 in NJ was the inventor of the 'Magic Eye Tube' as well as a pioneer in Radar.
Keep up the good work, I'll be binge-ing on more videos in the coming weeks.
Bob
Welcome aboard Bob!
When a teenager I mistakenly touched the capacitor on top on one of those old globe tube radios. The older the radio looked the more I wanted it. My bedroom had a bunch of old time radio circuit boards. Some would run but others not. The capacitor shook the muscle on the back of my arms. This was in the early 60's. Wish I had those radios today.
All that history...great project. I was an Electronic Engineer for 18 years in England.
I really enjoy watching your methodical approach to your fault finding. Reminds me of me 😂
That's awesome. I just bought an old Hameg HM 112 / 312-6 scope , replaced all caps, repaired some small defects and it's working! Great machine from 1976.
You gotta love that old testing equipment. Great video!
Thanks for stopping by!
Watch makers/repair put papers inside the watch cases with dates of cleaning or repairs. Later they scratched the same info onto the inside of the watch cases. Looking forward to this rebuild, Paul.
Thank you for re-awaking my love for electronics. Great channel!!
Glad to be that inspiration!
the master of electronics is back with another great video
It never ceases to amaze me HOW much can be done with so few "valves" or tubes as you call them. I LOVE valve stuff, memories of WW2.
Muntz brand televisions seemed to have very few vacuum tubes compared to most others.
Professor Carlson does it again with another great video. Great seeing this old testing equipment come to life. Many thanks !!
As usual, like a doctor examining the patient. Mr. C seems like he's in an especially good mood for this video. Nice to see.
Great motto - "If it's dead when it comes, it lives when it leaves!" Wish I'd thought of it back when I was fixin' for a livin'. Hope to build your capacitor checker soon. Thanks for the fine presentations!
I bought one of these in an antique mart in Florida maybe a decade ago. Hooked a wire to the back allowing it to trace, and it worked with no effort. Sold it off on eBay for about what I bought it for, as to not collect too many items. Regret selling that one ... was an interesting find.
Makes me wish I knew what I was looking at as a kid when my dad was repairing TV's and VCR's. So much vintage stuff came through our house and I thought the tubes, nixie's, bulbs, etc were so cool, but I was only like 8- 10 years old... I'd walk around flea markets with him and there were a few gear sellers also slinging "outdated" repair gear.
You are so right.... Mr Carlson If you can't fix........it's not Broken So awesome to watch you
These videos are amazing! Thank you so much Mr. Carlson.
You are very welcome
Thank you! I always enjoy your chats. I was lucky enough to have a dad, who would build Heathkits to get equipment. I got involved as the oldest. One voltmeter - swipe dial - tube I think was my go to as I learned. Switch circuits and voltage scale, were easy to see and understand. A full scale would only tap the needle. These last 20 or 30 yrs with the DMM's. Most do not understand that the time delay to read the issue may fry the boards inside before you ever know to stop. Looking forward to the build! Cheers Mr C.
This piece was clearly loved through it's time. -GOOD! It's supposed should be like that. :D
Thank you much for showing the story. The history is part of it...and that old flux. Can't get that enough of that...
So clean! Beautiful.
Thank you Mr. Carlson!
My pleasure!
Each time I watch one of your videos, I'm always very impressed with the expression of your knowledge and skill. It has obviously taken you many years to acquire this. Keep up the good work.
Thank you very much for your kind comment Mike!
17:06 that is precisely why I go for older stuff whenever it's practical for me to do so. For all its inefficiencies and bulkiness the old stuff will just never die. It will usually still function and even if it's malfunctioning it can be easily and quickly repaired, unlike modern stuff that's just 'discard and replace'.
My electricity is hydroelectric/nuclear anyway so I don't have carbon worries either. Win Win really.
BEAUTIFUL! Simply BEAUTIFUL Paul!
Looking forward to getting my EICO 460 up and running soon.
You ARE "The Tube Master"!
Patrick
Absolutely love the glow of those filaments. They just warm my soul.
Just wanted to echo all of the positive accolades of fellow followers and add that I love your pride in craftsmanship attitude that you impart. It's refreshing to see no matter what vocation it's coming from. Thanks!
My Dad had one of these and I still have it. Growing up my Dad used to work on all types of electronic equipment down our basement. Car radio's, tabletop radio's, phonograph, TV's etc.
I used to watch him and learned how to repair everything at 7 years-old and now I am 58 years-old.
Thanks for sharing your story!
Hi Mr Carlson's Lab
Inspirational.
Due to your videos and a bit of lock down (sigh) in the last 6 months. You have inspired me to pick up my electronics and start doing electronics again. The result is repaired 1 battery radio receiver. 3 mains valve radios, 1 solid state transceiver and assorted other electronics on the shelf to be worked on. Purchased 1 de-soldering machine, how on earth did I ever manage without one of these. In the last month decided to get my HAM radio exams out of the way. Then I will be off to Patreon, I must have one of your capacitor testers and your no contact probe, that will save a lot of time.
Sincere thanks to your self and your brilliant videos. Oh and in reference to one of your older videos, hysteresis (his-ter-ee-sis)
Fascinating detective work Mr. Carlson. From decades ago the story emerges.
Thanks Mary!
Great video! Your name was mentioned by Grant Wyness on soldering smds. He spoke very highly of you and your capacitor tester! I also saw your name mentioned on Antique electronic supplies website. (positively) Thank you for all your service and thank you. I will look into building one of these in the future. Good luck. I can't wait for a follow up on this!
thumbing through Mr. Carlson's videos and found this gem! this is awesome
Real fascinating to see this old equipment come to live again !well done Sir
Mr. Carlson is spoiling us. That radio restoration....now this. I usually give a like as soon as the video starts.... Mr. Carlson never disappointed!
I presume Mr Hewlett and Mr Packard were still at school when this was on sale
Maybe. Maybe not. Dave and Bill graduated in '34.
Now I can't wait to tear into my WO-33C. Thanks for the inspiration, Mr. C.
It's nice to see some of these things in person. I worked for an electronics supply company about 30 years ago and it was my job to look through schematic books and find part numbers for people and either find them in stock or order them for customers. SO I've had extensive use of schematics. We also sold the schematics to a lot of old electronics.
Astounding how such tech came into being a relatively short time after electricity was discovered and put to use.
Always a joy to listen and watch your videos! I sometimes put on one of your longer videos to fall asleep to.
Holy cow! 80 years old and that thing still has sync. That's amazing. The oldest I've ever used was what my engineering professors called "Stanley Steamer" Textronics scopes on those big carts that we still used in our college labs in the 80's.
Bob Sykes , If you look around, Paul has a number of scopes from Tektronics which are on carts because of their weight and size.
I am glad you posted a new video, I was watching old reruns of yours from 5 years ago while waiting for a new one. Good to see you are still bringing these old marvels back to life!
It just goes to show you just because something is old doesn't mean it can't be useful. Thanks for sharing Paul.
Dumont goes way back, I used to work on some of the TV's they made and they were built like tanks!
I have an old Eico scope and is similar to this one. I haven't used it for a while and this gave me the want to get it out and see if it still works . I recapped it back in the early 2000's and it was a good general purpose scope!
I have a 1960s one
Paul,
As always, another excellent video from you! I always appreciate the thoroughness with which you go through the details of all the important things that need to be considered and aware of in working with the older vacuum tube equipment.
I also am amazed at how well this thing worked without doing anything to it. The thinness of the line, the brightness of the CRT, other than the bent chassis and the discoloration and missing handle on the outside, this rig is in amazingly fine shape.
Really looking forward to the restoration on this one...and also eager to see more on the BC348 receiver!!!
Got some linearity problems, but nothing new caps wont fix.
Kinda amazing that it just fired up like that.
Excellent educative video as always.
One question: When you hooked up the signal generator it looks like the scope is not sweeping the horizontal linearly. Is that correct and how they worked?
Yes, much of the time, the sweep linearity produced a trace that looked somewhat squished at one end. Very common with older scopes. Thanks for your kind comment too!
Thanks for that info!
@@greggoog7559 Yes, I've seen several scopes from this era that had this behaviour, including one we had at school back in the 70s! If you look in radio magazines from the 40s "linear sweep" is advertised as a feature on some scopes!
Discovering the story is the best part of digging in to any old thing. I've discovered quite some stories hidden in my bus.
Mr Carlsons lab your Electronics from the 1930s is cool 😎 👌 👍
Hi Paul - I too am amazed at how many ancient items (un-messed with) actually 'live' ! Love that old Dumont 'scope.
I have a WW-II A.C.Cossor Mod: 3339 'scope + a later Philips Mod: 5655 which still work o-kay, probably a few leaky caps to replace by now, I imagine. Thanks for the insightful video. - Best 73, de Tony in S-Africa...
It's Feb 28th 2024, that kit over 90 years old. Amazing, well made simple as and long lasting.
Sir thank you 🙏 your content is mesmerising
My pleasure
Oh man! I love this scope! And you are more than right - there is so much successful and meaningful work one can do today with it, most people just don't imagine. Not having a calibrated grid and sweep, nor markers, does not rob you of the capability to "see" the voltage. Anyway, these days its not hard at all to give this scope a small companion - a time and voltage calibration box, which would allow one to calibrate the screen before measuring. Great piece, and I cannot wait to see it shine after your hands do their magic. All the best! Bill
Mr. Rogers is the best. Thank you.
Given as a gift. A Toledo duck crystal radio w/ Sylvania diode along side a Galina diode. It's 100 years old and used it to listen to a foot ball game recent. The ham was very elderly. And asked me to take care of his "rig" in the mid 90s. It's now 2021 and still running. To day. De kv4li 73
I am building your test tools, and conserving / upgrading vintage British equipment. E.G. Cossor 1039M or CT52 miniature O'scopes. I find that some upgrades are required in order to make them useful for low voltage testing: swap the Y amplifier valve for a more modern high slope RF Pentode to increase gain and bandwidth: remove diode valves and selenium diodes and replace with silicon, then adjust load resistors to compensate for the changed voltage: add a sync amplifier: add a HT surge suppressor to keep HT voltage under 400 V. Or alternatively make any power switch on the instrument switch HT on/off to permit first powering the valve heaters when powering from the mains.
There are chances that making some wav files of the initial "Hi everyone and welcome to another episode of Mr. Carlson's Lab" from some different videos they can be binary matched. Love it. Thanks Paul, I'm learning a lot from your videos, here and from Patreon. My lab is growing well thank to your inventions. Great respect! (Sorry for english mistakes, if any). Go, go, go!!!
Hi Paul,
I understand the underpinning theme of your channel is to present restorations of various devices and occasionally a project or a product review. They’re always interesting and extremely informative.
I and I expect a large number of other viewers would like to hear your views on newer inexpensive oscilloscopes and if possible a review and a recommendation. My personal interest is in the area of audio equipment.
Thanks
Mark
Thanks for your input Mark!
Very clean and unmolested inside, great to see. I was pleasantly surprised to see it fire up and function. Not only built to last (a bit cliche) but built to be serviceable - even if that's on the kitchen table.
Thank you for posting.
You're welcome William!
It looks like the old oscilloscope and I are both doing pretty well since we both came to be in 1933.
A few caps and it will be ready for the rest of this century :)
Gene it’s really great you are on the internet, your generation is underrepresented online, and like so many things taken for granted - once it’s gone it’s gone.
@@christopher3963 Thank you, Chris for those kind words. I hope to be staying around for a few more years.
Good afternoon Mister
Marvelous item !!! and fantastic construction !!! what the difference with today ....
Good job and explications
thanks for the share
Eric from France
To Carlson I was watching your video about your restoration on 1938 De forest 7D832 radio it was very interesting the radio is handsome I am a collector of pre-war radio’s one of my favourites is a pye type mm made in the early 1930s that Cambridge in the uk . We had one in school . My mother use to work at pye
Thanks for sharing your story John!
Paul... great video as usual! The oscillograph got me interested, so I looked up the Wikipedia article on Allen DuMont, and it said that he was a very important figure In the development of CRTs and television and even invented the eye tube. He did all that here in northern NJ. Thanks again for the great content!
You're welcome Phil!
Your electronic inventions is absolutely in genius
Mr. C. Thank You !
I've learnt more about Vacuum Tubes and the technology from Mr. Carlson than I did from my actual electronics class teacher. Dang.
Re old equipment: I can't tell you how many times I've found it was operator error. I started a new job in 1997 and as I was being shown around for the first time, the guy I was replacing mentioned, "oh, that's broken, that doesn't work... been meaning to send that out for repair, etc" to at least 10 different pieces of gear. In the months that followed I could not find one piece of equipment that was damaged or defective in the slightest. It was all operator error by a guy who just never bothered trying to find out how to work the gear in the first place.
That was so cool to see it come to live, thanks for sharing.
Nice one Mr.C..Great how she worked right off the bat. Love your explanations & tips...Thank you for sharing..Ed..U.K..😀
Glad you enjoyed it Edward!
The construction is very well done. Looks like other than the bent chassis this was well taken care of. Absolutely love the historic pencil markings. Folks you gotta give yourself the Carlson Edge!
Great video as usual. Thank you. Looking forward to the full restoration video.
Mr. Carlson, thank you. Your videos are very good. I have broadened my know of electronics far beyond my experience. Please consider a video on your historical back ground. Are you self taught. How did you begin learning electronics. Your presentation is very practical and unambiguous. Peter M.
Thanks to your channel here I just picked up a 500 series tektronix scope in a local ad.. Partially working, Cant wait to get into it.. I have other test equip but need a variac next.
Hi! As always, great video! For the next video, could you present the restoration and alignment of a 1940-1950s Zenith TransOceanic AM/Shortwave radio? My dad brought one home after the war and I want to learn how to fully restore it! Thanks for all you do to advance electronics and repairs!
Enjoyed your presentation. I used to have the same scope, but the power transformer
went bad in it. Which reminded me: In 1933 the line voltage was 110vac. Today the
line voltage is usually a bold 120vac. (a "bucking" transformer) is a good idea when
using these older electronic devices.
to see the hand writing the same in the writing of repair dates from the 40s to the 60s shows it was the same prepair person or owner.. crazy to think about
Hey Paul. You almost seemed disappointed it worked as well as it did😉... definitely back then things were built to last. Looking forward for the next one! Take care too. Cheers
I have a 1956 Hickok 195A which is the second upgrade to the 195 as you stated. Has a 5UP1 CRT, kind of emotionally attached to it since my grandfather gave it to me as I got started in electronics as a hobby in 1972. Took it out of use since the across the line paper wax 0.1 uF 400v capacitors were getting hot, before they pop. This video is getting me motivated to get some modern safety capacitors ordered from Mouser and get it fired up again. Could just clip them out for now just to do an assessment I suppose.
I have an Allen-Dumont 304-H and for its years it is functioning very well... They were leaders for this market before the advent of Tektronics ;)
Saw that in a 1930's SciFi movie.... :)
Just signed up to your Patreon, worth it just to get the schematic for your capacitor leakage tester! Been watching your videos for a while now, I've been into electronics for as long as I could walk & talk, and indeed it's my job as a repair guy at a DJ shop, but watching these videos I realise just how many gaps there are in my knowledge. You'll post a new video, and I'm thinking "ahh, so THAT'S how that works. How did I get this far without knowing that?" :) Keep up the good work sir.
Welcome aboard!
Hope you have time soon to do a rebuild of your RCA AR-88. Love the history of those radios.
If you had a version of that capacitor tester that used vacuum tubes I would probably build it myself. And probably jump on the patreon specifically to get the schematic for it.
You Know... That may be a neat Idea.
It's amazing that it's sensitive enough to measure your bodies electrical output. WoW.
Thath old Scope 😎 Real nice, hardly any new will last 1/2 as long.
Another excellent video. I have an old Dumont in the basement that is a little newer, but not by much!
Dear Mr. Carlson,
It's been maybe a year since I last contacted you. I have this antique Delco radio which I inherited from my grandmother, and I decided to try repairing it as per your videos. I removed the BED resistors and the waxy caps. I also disconnected the tower cap and replaced it with equivalent new 10uF electrolytic caps. The good news, I was able to find some poly caps which I used in place of the waxy ones, and I was able to locate the shielded ends of the caps. I took a whole lot of pictures and used them to determine where to connect new resistors and the new caps (Allen-Bradley resistors are so hard to come by that I had to make do with film resistors, instead). I replaced the unpolarized power cable with a reproduction cloth cable, making sure that the switched end was the hot lead. I was able to get it to power up (I built my own light bulb iso transformer variac kit current limiter to make sure that the radio wouldn't catch fire had it been shorted). One of the waxy caps was connected between AC power and chassis ground, and so I replaced it with one of those blue safety ceramic disc caps, making sure it was connected to AC neutral (the schematics call for it to be connected to AC switched which means to me that AC hot would be unswitched and AC neutral switched, which I think is dangerous).
Its "antenna" was just two cloth leads, all old and torn, and so, based on what I saw on some of your videos on the backs of all-American radios, I took one hundred feet of solid wire and made an antenna board out of a scrap piece of perforated pegboard, in which I spiraled the wire around about twelve times and put two more of those safety caps on each end of the wire (every RUclips video from anybody shows how to make a /parasitic/ AC antenna rather than a /connected/ one, and so I had to guess). The pegboard also provides ventilation for the vacuum tubes while keeping curious fingers away from the tubes and chassis (it originally was open backed).
Now, the bad news. I tested the radio and it makes not a sound. Not even a hiss, crackle, or hum. Nothing. So, knowing that you know more about antique electronics than I do, I would like to deliver it to your shop for repairs. I live in Los Angeles, CA, which I know is far away from Canada, but I don't know who else to contact. Please give me your business mailing address, and I will deliver it there.
Thanks.
Sincerely,
Steven R. Mayhew
Wow, that mic sounds even better than usual, how is that even possible??
Tube warmth
You know, when you get one of those ah ha moments! EPR! Duh!
It seems that I have always had a quasi understanding of capacitor failure modes! Apart from a shorted capacitor, DC leakage was the other and possibly the main reason why equipment fails! I have always been concerned with capacitor leakage but I still see plenty of people on RUclips that will simply put an ESR meter across the capacitor and say, oh! It's still good and yet it's capacity is making it look like an overachiever! This to me screams a problem with EPR, due to the DC leakage it's taking longer to charge the capacitor giving the impression that it now mysteriously has created more capacity in its current space time relationship LoL... No! It's bad and it has to go! Having extra DC on top of an AC signal will saturate the next component in line, it only takes a tiny bit of DC on top of AC for this effect to occur.
I have read an article from the early years and they were well aware of this issue back then, the article was about how manufacturers of TV's wanted to ditch the power transformer and just go with half wave rectified supply but Australia blocked it because the electrical system used the galvanized plumbing as the neutral and the pipes would corrode in 3 months...
So basically, it's not a new problem, it's been around for a very long time, and the lack of understanding of the problem is still with us today...
Maybe you should put your marvelous LCR Bridge into the spotlight alongside your EPR meter and show people what you really mean about EPR...
Besides, I'm dying to see it being used! I never knew that such a device existed and it's been right there hiding behind you! Maybe we can get to see it in action in the restoration video? (Please 🙏)
You are so very interesting. I built my first radio around age 10, but have done not much in the last 60 years. You've got a great set.
Paul, are you going to share the diagnosis of the sweep circuit, and ultimate repair of same? Would love to watch along. I have the Laboratory model of that unit, with the mammoth power supply that sits below the scope and control unit, this video has been very helpful! Thanks a million!!
speaking of basic test equipment there was a guy that used perfect pitch to trouble-shoot devices, the one day he got an oscilloscope, Mmm great video MrC...:) 👍👍
Many many years ago, I threw together a Heathkit oscilloscope. However, it came with a solder supply, but whatever it was, it did not have the usual flux. Whatever it had, it literally ate away the PCB's, each beyond repair. Years later, I threw together a Heathkit Hero 2000. This time I used my own supply of solder. My 1986 Hero 2000 is still working to this day. Although there was a flaw in the motor control board. When in sleep mode, the main +5Vdc was shut down, but a sleep mode +5 Vdc was still active for basic functions. But that sleep mode +5 Vdc was not connected to all of the the motor control board IC's. So the IC's that were used to connect the motors to +12 Vdc and GND or vice versa, to determine the direction each motor was running, now had no +5 Vdc supply. But they worked, most of the time. The signals fed to these IC's had now become the power supply by providing current to the IC through the input protection diodes. But when it failed, the whole motor control board went up in smoke due to the +12 Vdc line now being connected to the GND, rather the path being through a motor. I managed to fix the board by replacing the damaged parts, twice.Once finding the cause of all this, I informed Heathkit of this problem, and so they kindly sent me a new assembled motor control board, for free.