High Voltage AM Transmitter equals FUN!
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- Опубликовано: 29 сен 2024
- Let's check out the Globe Scout Model 40A Transmitter. I purchased this to do a restoration video, and got a surprise inside! To learn more about electronics in a very different and effective way, check out my Patreon page. Click this link: / mrcarlsonslab
To learn more about electronics in a very different and effective way, check out my Patreon page. There are many more videos there, and I share some of my very unique circuit designs as well. Click this link: www.patreon.com/MrCarlsonsLab
Mr Carlson's Lab
mvh Tomas
Mr Carlson's Lab : I love your videos, My Father was a radar engineer for Lockheed Aircraft Service he had a ton of those bakelite crystals and used to hand trim them to a specific frequency back in the day, quite a long lost art form in my opinion. Thanks for sharing.
Kind regards, Eric Dee
Mr Carlson's Lab I was wondering if I could get you to build a nixie tube clock that I could buy from you or maybe a kit with directions how to put it together
Mr Carlson's Lab awesome videos thumbs up keep up the good work
I’m not one who usually buys into online stuff. But I’ll take the dive and see what’s up. I enjoy electronics and I’m always looking for more insightful ways to learn
"when people took responsibility for their actions" true words right there.
Great video yet again mr. Carlson. Love watching these!
I don't think there has ever been a time when people have been particularly inclined to take responsibility for their actions.
At least they did back then more than today. Cartoons in the 1990s didn't have to warn you "don't try this at home", because people weren't completely dumb back then. Nowadays, people use their brains less and less.
Falcrist some people indeed shy away from responsibility, perhaps better to say held accountable. If you touched the b+ it was usually your own fault, you didnt sue the maker because the possibility of being injured existed.
As you go back in time, you see that people are less and less likely to be held accountable for their actions... not more (at least in part because almost everyone carries a decent quality video camera in their pocket).
Education and intelligence levels are slowly increasing.... not decreasing (at least in part because if you do something stupid, you'll quickly find yourself on youtube or facebook as an example for everyone else).
And I was warned PLENTY of times in the 80s and 90s not to try things at home.
What the heck are you people smoking?
Not the same crap you've been smoking, apparently. I disagree that intelligence levels are slowly increasing. People are still doing stupid things and it seems even stupider things nowadays than before. The whole YOLO and ensuing idiot maneuver that inevitably followed comes to mind.
I love this tech Im 64 years and studied the old hetdrodine tube type tv and radios. Dont see much of this at all anymore. Thanks for the video.
You're welcome Greg!
"This was built in the 50s, an era when people still took responsibility for their actions" 😂 Couldn't have put it any better!
Well said! That really struck me as I'm from this era...things were simpler then and developed situational awareness as a bonus.
I feel like an electronics engineer that is willing to sell something with exposed high-voltage wiring to hobbyists' homes where children are liable to get at it isn't really taking responsibility for their actions
😂
@@toresbe I completely agree. It would be trivial to put a shield over exposed line-connected and high voltage terminals. It was irresponsible to leave the 120V relay screw terminals exposed to anything that might drop across the closely-spaced terminals.
bummer for those that did that and still had accidents and died.
Smiling!
Back in the 80's I worked for Missouri Radio Center/MOcom. The owner took in an old WRL Duo Bander 84. World radio labs. I gave him 15 dollars for it, took it home. To my surprise it worked on 80 and 40 meters, after I cleaned it of all the hay and bird poop. Took it out of storage a few years ago and not working so good. Your video may have inspired me to try and get it running again,
An era when people took responsibility for their action: how true this statement!!!!!
Oh what memories you have brought back. There was the Globe Scout, Globe Chief and
the monster Globe King. I still have much of the old AM transmitting equipment like
an ART-13 from WWII Aircraft. Lots of high voltage there. LOL
All great equipment!
My Dad had this radio back in the 50s. I have always wanted this transmitter, good find. I have my ham license too, but ham radio is not like it used to be back in the day. I see the old filter capacitors have been replaced with a bank of new electrolytic caps. Electrolytic capacitors become trash after 10 to 15 years.
I've always loved electronics and poked around with it. You have got me hooked on playing with vintage systems Thank you
Thank you for explaining how the circuit works, very educational. I enjoyed it very much.
Yes would like to see the Modifications !
Very nice class Mr. Carlson..... Enjoyed the schematic part the best, thanks
It looks as if the "Phone/CW" switch interrupts filament voltage to the voice tubes when in "CW", so it might be a good idea to give them a few seconds to warm up when switching into "Phone" mode before transmitting.
By the way, I seem to recall that the tuning instructions for the 70's vintage RCA TT-25FH (television transmitter) aural PA pointed out that maximum efficiency would be found just to one side of the plate dip. You would dip plate current it to get close, then peak the reflectometer (power output meter), just off the dip point.
Excellent video, as always!
Always a pleasure to see a new video from you.
Your detailed information about every part of the equipment nearly gives me goosebumps (-;
I had HIGH voltage go through my hand once when I was working on a Transmitter. Almost 3rd degree burns. I still have the scars. It was MY Fault. LOL. It doesn't hurt to be electrocuted, but when you wake up...if you do, and your hand is on fire and smoldering, nothing takes away the pain except Demerol in the Ambulance. Morphine does nothing for burns. The voltage melted/punctured my fingertips. Your body part doesn't hurt for about 20 minutes because of the adrenaline, but after 20 minutes it's unbearable. I learned a valuable lesson that day. Never have both arms inside a radio at once if you can help it. Take off all rings and Jewelry and only plug radios into a Variac and Isolation Transformer to work on them. ;)
I had a similar shock off the tube EHT on an old projection TV. About 30kv from an overwound mains transformer, supplying the 1.5 inch projection tube .. Knocked me across the room, and boy was it painful.. Still have the scar...but still alive 60 years later..!!
Sweet! Looks like I'm not going to bed yet. Thanks Mr Carlson!
One of the wisest statements you have made, "back in the 50's an era when people took responsibility for their own actions" So very true and a lesson many should learn from. Those were the days when NO ONE would buy a wire antenna and many of us built at least 1 transmitter, feedline, our antenna relay boxes and we repaired our receivers. We depended on the elder Ops in our community for advice and parts if they had them. No hand holding and no cottling. When we were old enough to go off to college and exams came, our professors didn't bring kittens or Lama's to help us cope with the stress. You either passed your exams or repeated the courses; no excuses either way.
What has happened over the last 50 years??? Not saying all of the latest generation are wimps, certainly NOT. However way too many are..
I'd vote for modding the xmitter as well. I would not be surprised to see audio improvements byt trashing the 2 RC packs in the audio path. It would also be interesting to look at the signal on a spectrum analyzer and see if improvements could be made to improve the second harmonic radiation.
73, Glenn WA4AOS
id rather live in the present time than back then, even with the problems of today. its nice to not have to shoot/kill people trying to assault/murder me because im gay.
Terrific video, you teach me so much! Thanks Mr. Carlson!
My pleasure!
Yes I would love to see you hot rod the globe Stout Scout transmitter the wonderful video I loved it thank you very much for your hard work
If it's on Mr. Carlson's channel it's fun!
Sir the 807 plug at the back used as safety key so that if the operator wish to keep the transmitter unused by any other person when he far away he pull this plug out and keep it in his pocket so that if any body play with this transmitter or the high voltage will not make a disaster and kill him self . Thank you very much for this nice video which pulled to my youth at around 1960
I had one of these when I was a kid ! I was going to a class to learn CW and theory, on my way to get my novice license ....! It worked pretty well, the ham I bought it from showed me all about the HV items and how to tune it up. I can still the remember the smell of the dust burning on the tubes ! lol
6146 good tube, rated about 90 watts input/plate disipation, had one in my first cw transmitter,m an Eico 720 in 1962 as a novice...in 70's had 2 in my old FT101 ssb transciever
the 'pie' network looks can also be seen as a 'pi'. if you draw the symbol of pi, you have a component left, top and right: the same as on the schematic.
that is the way i learned it.
but the piece of pie is new for me. thanks!
Call sighn, KB3HAY, What a great video as always! love amplitude modulation and I would like to see all the mods that can be done on this fine piece of equipment. Love this channel!
YAY-AM Mod it please! also I had one of these globe scouts. neat transmitter but it needs a huge amount of drive from a vfo for it to work correctly. I used a WRL 755 VFO
Paul, Here's my vote for you to show us your hot-rodding this transmitter!
Hi Paul.. Great choice.. G8DGR ..When you get it going 14.055 Mhz
G8DPG - must have got the ticket about the same time in the UK.
Great video. Just to be pedantic, the pi network is so called because it looks like the Greek letter pi π, as opposed to it's cousin, the T network.
Interesting circuit. audio circuit has no blocking cap on the input, second stage has grid to wiper...
u know what id love to hear you speak about it at&t long lines such a fascinating system to me for some reason but i understand this is not really that type of channel and theres very little of it left out there.
Please do a "hot-rodding" video of this transmitter.
Such a niche guy knows what he is doing too
LOL "This really hurts if you come across it! That's all I've got to say." LOL I'm sorry Paul, the way you said that.. I'm sure glad it didn't take you out Paul. That's all I've got to say!
Lets have a look at the mods for this transmitter.
Looking forward to the mods.
Mod this baby, please. If you already have, where is the link?
I would love to see what you do to soup it up.
At 15:15, is that a "diddle" tool' a spudger, or something else? And, as always, another excellent video...
You won't believe the following with an AM broadcast transmitter. Me & my brother used to be friends with a technician & DJ of a 1 kw AM station where I live. The building & tower are still there,but the place has a 1kw Harris AM transmitter,the rear of which sticks into the bathroom. Also connected to the back of the transmitter inside the bathroom is a spark gap,some coils & other things that I know could be energized with high voltage or RF! I mean these things are bare & exposed & I didn't want to make a wrong move & end up touching what I mentioned & getting zapped or worse while using the bathroom! Also,anyone tried using an isolation transformer setup with two transformers? I have a pair of three phase to single phase power transformers from a pair of elevator control cabinets & I did the following-connected single phase 120 to the 115 volt taps, measured 440 volts at the three phase taps,unplugged the cord & connected the three phase taps to the identical three phase taps on the other transformer, plugged the cord back in & measured 120 volt output on the identical transformer on the 115 volt taps.
What is the reason for the plug in the back ?
When you have an INSANE amount of time on your hands
Make it a beast!!! Hot Rod it!!
I was watching 12 volt vids blog when he went to the maple ridge ham radio swap meet, and i swear thats you at the 7:37 mark sitting in a chair. Is that you?
Definitely want to see your modifications!! :-) 73 de DH0MAD
How do i watch your videos :
Step 1: Thumbs up!
Step 2: Click on play!
Great video ty
Anyone else ever expect Grommet to jump in and assist ?
400 DC is instant ☠️💀 death
I would cover those connections
God, we really were reckless back in the day
And to think, I have taken 25KV through the hand, and have the cartilage filled hole to prove it.
@@MrCarlsonsLab God must want you to be here. You are really lucky to be alive
I was having a really bad day, then I saw your video and while my day is still kind of bad, it brings some sunlight into it. Thank you!
dito
Same here, pneumonia on a holiday off because someone wouldn't stay home while sick...
@@garbleduser Where do you live that you couldn't claim the time as sick time instead of holiday?
Great video! My first transmitter as a novice was a Globe Scout 680a, very similar to the 40A. That 5 pin connector in the back that looped the heater and B+ through it was used for when out in the boonies. A 6 volt storage battery would light the tubes and a dynamotor or vibrator pack would provide the plate voltage. Many older receivers had the same loop through plug/socket. My dad was a ham too. Today he was born exactly 100 years ago today. He has long passed though. But it was cool to see this today. Dave-N2DS
Thanks for stopping by Dave!
Someone threw away the dynamotor for one of my radios. He thought, and rightfully so, it was an old automotive part.
I would have given my left arm to have your tutorials on demand when I was 10 years old and even younger.
I had no information back then. Just fascination , electrical toys to take apart and the odd electronics project kit.
So great Carlson Thx.
I could'nt agree more.
I remember building my first CW transmitter from an old television set purchased as junk from the Salvation Army thrift shop for $1.00.
I salvaged the excellent power transformer, but I was very fearful about putting the transformer primary across the 120 VAC power -----that would be a short circuit, wouldn't it? So I studied up and learned something about inductance and reactance.
My one piece of equipment that I designed, built and operated entirely by myself was a telephone answering machine. This was circa 1970 when home answering machines really wern't available at all.
I used a capacitor across the telephone circuit and when the ringing voltage came from a call, that voltage went through the capacitor and triggered a relay, set up as a locking relay. That turned on power to a couple of tape recorders, and power was witched between one that play a message on an endless loop of tape and then a thermal time delay relay switched to a second tape recorder that recorded a message.
Worked reasonably well, and I never got in trouble with the phone company!
I had everything nicely packaged in a plastic box.
Don't ask me about the OTHER box that allowed me to receive long distance calls without the caller being billed for them....
Yes please to the modification video!
No modifications needed please!
A modification video on this RF amplifier would be marvelous Mr Carlson! I'd be interested in signal clarity and RF power increases for example.
another fine quality natural selection helper device, we need more things built that way ;)
There must have been Elmers so that you would learn without the shock.
@@ProperLogicalDebate I received a nasty shock one evening when working on a 100 Watt class plate modulated transmitter. I had it powered up into a dummy load, plate voltage on full, and I have the meter connected and was adjusting a sliding tap resistor with a screwdriver while monitoring voltage to the modulator tubes. At some point I got a bit careless and my index finger touched the metal stem of the screwdriver while my left hand contacted the chassis. I got full DC plate voltage in one hand, through my heart and out the other. It knocked my across the room. For a few seconds I saw a bright flash then stars, had a metallic taste in my mouth, felt off balance. When I recovered a few moments later I could smell burned flesh where the current entered my right hand. It was a painful shock and when I think about it I can still feel it to this day (it happened around 20 years ago). Since then I never entered my hands near a transmitter (or any HV device) with it plugged in and the power on. Even if I am making adjustments it gets powered down, unplugged and discharged first before my hand gets anywhere near the insides.
Yes, I want to see the modifications! Thank you for this beautiful piece of vintage gear! 🙌
Mr Carlson you have the perfect voice and tone for your videos. very professional.
I would be interested in seeing the mods for the Globe xmitter. Do you plan to do a vid on the Johnson Navigator? I am fortunate to have one in really top shelf condition and it's a sweet xmitter, less the vein type meter. Though, it's more stable than the unit's Heath used on the DX 20 & 35.. 73 de Glenn WA4AOS
Thanks for another great video Paul! Ya know... One time I got a nasty hit from a Heath DX-60 but I never considered blaming Heathkit for that. :-)
Thanks for the video, I will use this as a reference when I get around to restoring mine, I have one just like it that a friend gave me. It needs new decals or labels for the front panel, if anyone knows if they are available for this unit somewhere let me know!
I would very much like to see more RF / HF, Tx, Rx projects Paul. As a new Amateur and a Patreon following along in your Electronics Course, I'm finding your training highly instructive in working towards my Advanced license. Many thanks!
Thanks for your feedback Paul!
@@MrCarlsonsLab I love listening to HF although there's not as many Stations online as before, maybe you can include repair of some of the classic receivers from this period Grundig Sony etc. Thank you.
Ahhh the 50s... A time when you got shocked really hard for beeing stupid and had no one to blame but yourself. Natural selection was a real thing back then :)
I know you're just being diligent when you warn us about the high voltage and the like but I'm guessing most of us who watch your videos come from the school if you stick your finger in a light socket it your fault not the company that made the light socket. Love your videos. I've learn more than I care to admit watching your videos. Thanks for taking the time to produce them.
He does it because of possible liability is my guess.
That's just what I did when I was a kid, stick my finger in a light socket to see how it could light that bulb. I found out.
@@dougstrong696 Every curious kid did that ONE time.
Wonderful and very interesting,Thank you.
A "thumbs up" FROM Mr. Carlson is very high praise indeed...
I have learned so much about transmitters from these vids!
Can you do a video on a HEATKIT DX-100 sometime? I just bought a really good one and may change out old CAPS for new. Have never done that! Thanks
Hi Doug. I have 3 waiting for the bench.
AWESOME!
i am 78 years old now, but when i was a kid in detroit area, W8BXO, doc. weston, taught me everything about ham radioˇ bless his souľ Great show
Hi Paul , Yes it would be nice to see you hot rod this one, I use a Kenwood TS 820,so dipping and setting the plate is away of life, scares many hams I must say, I've had my TS 820 from New, she has't bitten me yet:)
Paul de M0BSW
Thank you sir for another great video. I still use my old Swans. Also like you informing the new folks about B+ and its potential for being lethal and being responsible for your own actions.
Perfect video me, thanks. I'm in the process of homebrewing a AM valve based transmitter. :) Good caution notes on high voltags :)
Thanks for article! Reminds me of my early ham radio days (ex-WA2YTO) and my original transmitter, an EICO 720, also with a single 6146.
So much of this just goes over my head, but I still enjoy watching these videos.
It's sad that the expectation that users of equipment will know what they're doing and will take responsibility for their actions is now considered quaint and old-fashioned.
It's also sad that so many people today are freaked out by circuits that use anything over 30 volts or so.
You shouldn't fear electricity, but you should sure as hell respect it.
Wow. I have never seen an older tube-type radio in action. What an excellent presentation! Modern transceivers make things so much easier and a lot safer! I would love to build a tube-type transmitter one day and operate CW. I have a passion for Morse code. 73 de AD0WE
WRL made great equipment. I enjoyed watching this video very much. I had the Globe King 400C that put out 400 Watt on AM. It was rock solid and I had all the coils for the 20 - 160 Meter bands. I had a Johnson Viking 122 VFO and a wonderful National 183D Receiver. There are a couple of pictures of me with my rigs back in 1958 on my Facebook timeline. My call sign was K9BYI. I got my novice license when I was 11 years old. Looking forward to seeing more videos on older ham gear.
Thanks for taking the time to write Bruce!
Thanks Paul! Lot's of excellent information! Would definitely be interested in the 'Hot Rod' session to amp this old boat anchor up a bit. de KI7SXG
I want to add his electronics course is the best I have seen. It also covers surface and through hole, tube , and PCB making.. Awesome course !!!
Would love to see a mod video :)
Yes, I would like to see !
Sure would like to see mods to the transmitter, Very nice video, keep them comming. Greg
Im a new broadcast "engineer" hire. I am in awe of the ingenuity and brilliance of the engineers before me. I feel really dumb when I look through their old mods and hand drawn schematics. I fell into this job and want to say thanks.
My vote is probably too late, but I would love to see your mods to this unit. I'll poke around, maybe you already did one. F.Y.I. I spent my first two years in the Air Force working on AM avionic transceivers (AN-ARC793 and AN-ARC546) that were installed on the F4 fighter. Lots of fun with tubes and high voltage and motorized mechanical tuning. We eventually retrofitted these planes in 1981/82 with an all solid state modular unit AN-ARC164. Back then I had all the latest and greatest test gear that I don't have now. Thanks, Mr. Carlson, VERY interesting and instructional video.
Superb video! Thank you! I'd like to see the voltage across the key/oscillator cathode. I'm building a transmitter using grid block keying and wonder how important it really is.
Wow, great video, certainly for us old timers :-)
"took responsibility for there own actions", what a wonderful era it must have been...
"This was built in the 50s, an era when people still took responsibility for their actions." And we had a much saner and better functioning society as a result.
“An era when people took responsibility for their actions.” Love it 😊
Yes, please show modifications! I had one of these back in the late 50's; brings back a lot of nostalgia...
Great video. When I first got my general in 1959 I built a Globe Scout 680A which was similar to this one, but ran more power. You have a great way of explaining things!
Welcome to the 50's, where if you die it's your own damn fault. If you need any lead paint it's in isle 4 next to the asbestos. :p
YAYE finally something worth watching on "the RUclips" im always happy to see you posting a new video.
hell yes I wanna see you mod the scout. ya know, for science. :) -W8SDF
"when people used to take responsibility for their own actions" Subscribed...
wow, thanks for all the explanation, very educative :)
got some interest in tubes, just built one cheap (10$) chinese tube headphone amp, havent got test it yet
not even sure now if I need to feed it ac or dc X-D I guess that its safe to try first with DC :D and even better idea to teach my self a bit more about tubes to be able to just see it from schematics..
I'm very happy to see this Paul, I have been waiting :), and wow, what a responce already, lots of likes and comments. I can't wait for more of these tx'ers! and come on, every one has to love WRL! 73 Paul, really enjoyed this one..
Awesome video! Dang man, thanks
Thanks for showing this nice piece of history off Paul. Very enjoyable this morning. Cannot wait to see the de-potting of the transformer and modifications to the Globe. Just tore down a old piece of equipment this week end from the 30's. Was afraid it too me have hidden caps but lucky was not. Video soon. Take care and thanks again.
Thanks for stopping by Buddy!
The same goes for me. I would love to see you getting that old girl working to her full potential again.
The Radio Shop n
I have a Globe 300 it was a product of WORLD RADIO LABS of Council Bluffs Iowa
One of THE Big Ham Radio
sellers in the late 40's and 1950's and they were SO Big that they decided to put out their own line of Transmitters 😅 which basically competed with the Johnson Viking and Ranger
transmitters. WRL is just one of the great names of the Ham radio history's Golden Domestic built gear era.
Wonderful memories......
Great video. Yes, I would be interested in seeing a video on how to get more watts. I have a 5 tube Hallicrafters HT-40 that uses a single 6DQ5 for the final instead. Although a different circuit design, it is similar conceptually to the Globe Scout overall.