My father was a EE working on radios for VEF in Latvia before being "repatriated" during WWII, spending the last year of the war doing the same at Telefunken. Aside from the PCB, the radio reminds me of many he talked about. I'm not sure when they went from "chassis wiring" to PCBs - surely after the war, and after he came to the US. Thanks for jogging my memory about dad's work, and spending hours with him in his electronics lab, learning things like how to bias tubes, and soldering. We put many Heathkits together even before I was old enough for my first science class in school. I think he'd have been proud of you, both for your skill as a diagnostician, and for saving an old Telefunken radio. Warmest regards!
@@christopherlong2301 he's amazing isn't he. Blindingly intelligent and a master at electronics. So impressed. I'd love to know one millionth of what Paul knows
I bet Mr. Carlson knew exactly what the problem was from the moment he tried to tune in a station. He just went through the motions as a teacher would so as to not look arrogant. That's the kind of guy he is I think. It's getting hard for him to maintain the modesty because we all know how good he is at his craft.
I'm old enough to remember the fading days of the USSR, but it still surprises me every now and then when I see something like "Made in West Germany." Gorgeous unit, and I hope its owner gets good use out of it now you've fixed it.
THAT was TOO easy! And Telefunken, one of my favorite electronics companies of all time. Too bad they do not still manufacture tubes. But the russians manufacture high quality replacements. Thanks for sharing this beautiful radio with us. Clean it up and it will look like new again.
A very similar radio sits on a shelf at my grandpa's place, nobody turned it on in ages after I explained that it needs restoration to work safely and good. This could be a good occasion to make it sound again. Thank you for the inspiration!
This show was great, short and sweet. Sorry, I am not an electronic person (did help my dad build a Heathkit Stereo receiver and amplifier as a kid) and some of the stuff you talk about is over my head. I do like old radios and such and it's nice to see someone who knows how to work on them. Thank you!
Back in the day real radio repairmen never carried schematics with them because it was all inside their heads. Years of learning by doing and (of course) studying electronics we see by Mr.Carlson's example that saying still holds true today. Great video!
Slightly off topic, but thanks to this (and some other) channel(s) I repaired my first active speaker set. I recognized 3 PCBs: a 'power+amp' board, a control board and a small inputs board. Since I had already recognized the characteristic 50Hz hum that was quite loud at power up and faded after a second, I had actually identified the problem before even opening the box. The power section had 2 beefy 3300uF 35V caps of which only one (as if it was intentional, to help a novice see the difference) was bulging at the top. I replaced both. (Panasonic=ok?) This channel helped me identify the sections, know the function of the caps, be aware of the risks - especially in the power section - and therefor gave me the confidence to try this repair. So thanks Carlson's Lab! (I also want to thank Murphy for keeping me alive and for not giving me the hardest problem, but actually the ideal beginner's project.) (For other beginner's reading this - I had already done some digital Arduino stuff, so not a complete beginner, but power-supply and amps are really a level up. As in, level up on the death-wish list.)
It would be fun to pit the best RUclips technicians against each other in a race to diagnose the problem in the same radio. I know who I’d put my money on! Always a pleasure to watch you work, Paul.
@@domi7007 Freiburg is the most desirable automatic I think.. motorised volume control, buttons light up when pressed, push pull output stage and large good sounding speakers. Those germans at Saba really went above the rest, there was nothing like it. Meersburg and Schwarzwald where the other automatics from memory. Freudenstadt was just like Meersburg but without the automatic search function.
Dear Mr. Carlson , I too like many others become inspired by your videos and impressed by your electronic knowledge , I thank you sincerely for lessons that I received through your videos.
My parents bought one of these new in the 50s and they still have it! I haven't turned it on in years, looks like I need to clean it up and see how it goes. I was always impressed with the bass on this radio and I loved the "Jazz" button, how late 50s can you get!
As a child growing up in Uganda in the 1960's my family had a Telefunken valve radio and I have vivid memories of the dials, buttons, strange writing of musical notes and the 'Hi-Fi badge. Made very good audio and was pleasant to listen to. Then, in around 2017, I saw one come up for sale online here in New Zealand and I had to have it. It looked a bit similar to the one we had all those years ago so I got it. The seller was retiring and he must have been a radio technician as he had a number of valve radios and parts for sale. My Telefunken set is not working , does not power up (from what the seller told me) and I don't want to dabble into it as I do not know anything about radios and their circuitry. Would have sent it to you if I was closer.
"That's the problem with intermittence - this thing might all of a sudden start working and we won't have our culprit" I wish more people understood this in the context of computers as well. Software can be the same way - I always used to say when I was doing desktop support that restarts DELAY the problem, they do not fix the problem. If we take some time to think and investigate we can at least find out what's happening even if we can't fix it (it can always be fixed, but generally it'll be the software vendor who has to do it at that point, in that context). The only saving grace of PCs is generally there is an event log that might help you figure out what's going on. It's awesome to see that the same sort of thing exists in other contexts and in other technologies, and maybe some awareness should be brought to this concept. That said, between you, Mr. Carlson, and finally having the time to watch the new one from Ben Eater it's a good week!
Was working on a Powerbook 100 Power supply and I was getting like 11v somewhere i should have had 165. Traced it back to a 1ohm 2 watt resistor. It looked fine, but measured open. Replaced it and bam, back to life.
Great video, i have the same radio in my living roon I picked up from a flee market a few years ago. It is still working fine. But now i have an idea where to look when it will fail in the future. Thanks for that. Greetings from Germany
Inspired by your videos, I've started a restoration project on a WWII era Canadian General Electric G-62 receiver that somebody was throwing away. Aaaaand what I thought would be a "restoration" (the laminated wood chassis isn't in too bad condition), turned into a near complete rebuild. The wiring insulation was all crusted to crap, crumbling as soon as I handle it, and the sockets were getting pretty brittle. Most of the resistors have drifted out of spec. The electrolytic, foil, and paper caps are getting replaced, as you'd expect, but most of the black mica's are still within spec. A few mica's have cracked housing and one has a broken-of lead, so I'm just ordering enough parts to replace everything but the pot, tuner, valves (which seem to be good, near as I can tell), trimmer capacitors (which are all still good) and what looks to be a precursor to ceramic capacitors that still seem to be within spec, so I'll leave those alone. Got the schematics, so it's like building a kit from scratch!
I had one that was my Dad's Telefunken, Junked it from ignorance. Now I rebuild and refurbish tube radios. I love to hear them come back to life. They have character, Where the new Chinese ones DO NOT. Micro circuits, Yuck !
Yep, they're great for kids as long as the kid doesn't have access to a screwdriver. I was a terrible kid. I had the back off everything. How I didn't kill myself, I don't know. My very worst experience was taking apart a fully wound dumpster 7 day carriage clock. It's human nature to wind a clock up as tight as you can to see if all that extra energy will make it come to life. But, if you dismantle a fully wound mainspring, it's literally like a bomb going off. The energy in those springs can cut fingers off and whip eyes out of their sockets with no effort at all. I was lucky and learned very quickly from my mistakes that reading about what you're thinking of doing do can prevent some very nasty accidents.
Those valve radios with PCB's in them really make me laugh. That was around the time they were being replaced by transistor radios around 1960. Am I right? I also wonder what happened to speaker manufacturing, The number of times I power up a very old speaker to find it's 100% better than a modern speaker surprises me. They used to weigh a ton, but they had fantastic bass resolution and warmth.
When I still repaired tube radio's mostly in the 60's my first look inside was to identify resistors having blackened their code rings. Only wire wound resistors remain more or less the same even when overloaded, but carbon and metal film alike do this. After checking and in most cases just renewing these and watching out for condensors connected to them as potential failure origin, lots of problems did not need further sorting out. I was not aware German radio construction moved to printed circuit boards in the time of the Noval series of tubes in the 80's series (like the EBF one mentioned here), The last German one I repaired was our own Blaupunkt with both Rimlock tubes from the 40 series and one strangely out of place metal (wartime?) tube the EAA11 for the FM decoder. Its RF tube used in the FM section doubled as a AF preamplifier tube feeding to the powertube EL41. It took awhile for me to understand the tiny circuit diagram glued in the wooden case: who would think of such doubling solutions! In any case this way of minimising the number of tubes while introducing FM reception still resulted in an expensive unit, which always had a lower performance in the FM decoder and could never be correctly adjusted over varying signal strengths. BTW at the time we got this radio as a present in 1952 or whereabouts, FM broadcasts were not even live in Holland at the time....
Nicely done! Troubleshooting with your fingers to check tube temperature and guessing it was B+ voltage open circuit somewhere is art as much as science. Telefunken made great equipment and it was so pleasant to hear that deep resonant sound come out of the speaker. Bravo.
Thanks for your very instructive videos and it's good to see that you can fix a tube radio with only a multimeter! I was a teenager in the 70's and trying to fix old radios (tubes and transistors), I wish there was RUclips back then 😂😂😂
8:27 . . . When test equipment can kill you! A service contractor who looks after our UPS systems was at a different site and had a Fluke meter fail in such a way and thought a 370 VDC battery bus was de-energized, and started dismantling the hardware to replace the batteries. And arc flash explosion occurred and has was in the hospital with burns to his face and arms, damage to his eyes, and off work for months. Even good quality test equipment like Mr. Carlson's Agilent can suddenly fool you with a wrong / frozen reading. Always use care. If it's something that could be lethal or explode, use a second tester.
"There's a lot of music around the FM band, and you know what that means...." Yeah I know, punishment. Very fast repair Paul, nice. I had some difficulties seeing the little black electrolytes. In my memory that was part of the solid state era, not vacuum tubes. Must be entering the new times here.
My family has had this same model of Telefunken since it was new. I think it was serviced once in the late 80s, but is still running very well. Neat to see the interior of it and how it (should) work!
Thanks for these videos, I love them. I'm a complete beginner trying to learn some electronics and enjoy them all and learn what I can. Much appreciated!
Paul, there's another way to check resistance in circuit with solid state equipment. I watched a video from diodes gone wild and he used the MESR-100 ESR Meter to check for a shorted transistor in a switch mode power supply that had a snubber network and an inductor in the circuit, a multimeter would have fallen over in this situation but the ESR meter saw the inductor as an open circuit and he was able to check the resistance without removing anything! I have never seen anyone use this technique before! Once I saw that! It couldn't be unseen! LoL now my ESR meter has a second purpose in it's useful life! It's not a win win situation but it's definitely a win more often situation... Having the ability to test components in circuit makes life so much easier!!! Thanks for your time and effort that you put into every single video! I'm not a big fan of radio! But I watch every video that you put out with anticipation as do most people.. the TV's in my house have become obsolete, no one has used them over the last few years! Had this sort of content been provided on TV, RUclips wouldn't have become what it is today! That's Lamestream media for you LoL...
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
Mrcarlson, I would be honored to join your patreon page. A year or two ago, I become a patreon, and I think I unsubscribed after a week or two. At the time I was more interested in partying than studying. Anyhoo, I believe that you blocked me from accessing your page. If you care to unblock me ill gladly join at the 5$ level. My account name is Juan Cervantes. As a beginner in electronics Id appreciate the entry!
I find these instructional videos satisfying and addictive. Reminds me of decades ago when I was being trained in electronic diagnosis and repair on very similar circuitry.
Another awesome video Mr. Carlson! I have the exact model Radio with schematics. I bought it some years ago from a guy in the Netherlands. He was a dealer in tube radios.I tried the radio and I was not happy with the sound. It did not sound fulsome. It gradually sounded distorted to my ears. I was planning to send it to Radio Doctor for fixing but I changed my mind. I am in Canada. I still have the radio secured in a box and I am planning to have a look at it one day. Thankfully, I have and isolation transformer and a variac. Someone who used to work tube equipment suggested that it might be the rectifier.
Thanks for taking us along, I really enjoy the ride. Its been a lot of years since I’ve been inside electronics on a regular basis. This reminds me of how much I’ve forgotten or never really knew. Thanks for the class.
i am glad to see you back Mr Carlson i really understand more about the older vacuum tube radios in the way you explain it in your videos you are good at what you do nice job
This video is so serendipitous because I have recently purchased the same brand radio but a slightly different model that has a tuning eye. though the radio works I would like to clean and inspect it and I would very much like to thank you and your channel for helping me with a lot of radio projects.
Yoyr the man Paul. Huge fan I learned so much watching your videos. I'm more into rf amplifiers but actually learned to love audio amps from you. And im going to become a patron this week as well. Greetings from the state of Maine my friend
Thanks Paul. Nice radio. It seemed like a fairly easy fix....but then again, your are a master with these things. Let's see what you'll bring us next time! Cheers
Glad to have you back! Very nice looking radio, my wife asked right away if I could get one in our living room :) We have a WEGA 209 in there now, but I think with age we tend to like older styles better. Thanks for the great video! I would remove the caps on the transformer right away, they look like one old type of Wima's, they fail miserably with time.
I fixed a Phillips multiband and it nearly drove me mad. The IF adjustments crumbled to the touch...so I stopped touching them! Works ok, but wow, those European components were literally foreign and it was packed tight like a watch. Beautiful dial though, but...never again. Thanks, Mr. C!
Hey Paul absolutely cool to see you working on european radios. I am a well today was my birthday so I am a 19 year old student who is basically fixxing these radios. The big problem of east german radios and czechoslovak TESLA radio is that they were wired for 120/220V. Today main voltage is 240 and it just absolutely torches stuff inside with the voltage raise.. Gotta say you are the biggest inspiration to why am I collecting obsolete old JFET stuff with pilotlights :D . I have quite extensive experiences in repairing TESLA radios and it's nice to see your hated waxies getting dumped. We have our own version of that too brown pressed crappacitors that overtime crack open and or asphalt caps which I call chewing gum caps..lots of fun things. I was at one point considering doing the same you do with youtube. I do a lot more than just radio repair. I design SMPS audio amps both tube and transistor and a lot of PCBs. Well definitely looking forward to your next video :)
Excellent demonstration of safety procedures and basic diagnostics. I tended to use a highlighter when following very busy schematics. If something gets messed up, the page can always be reprinted/recopied 😄
Great video! I have two of these Telefunken small radio's in the European version (with station names on the dial-glass). They are cute, aren't they? One of them I restored for our teenage daughter. She also uses it as amplifier & speaker to play mp3s via the PU/gramophone input.
Great troubleshooting, Paul, thanks. I'm sure I wouldn't have been as fast. Also, I too, often put heat-shrink on my probe tips, or use the screw-on covers that usually come with them, but the finger guards often can't go around nearby components. Watching this video finally convinced me to order some 7" pincer probes for my DMM. Thanks again!
Dear Paul, your audio sounds great, would you make a video of your chain of recording? Great videos I enjoy them a lot thankd you for your effort! Well this was a short one :)
Greetings from Kuwait Mr. Carlson. I have the same radio in my home in Sri Lanka. Today I have learned something from your valuable video which will be useful to me in the future. As always I thank you for your great videos God bless you Take care
Hi Paul, great video as usual. You have my same DMM Agilent U1252A, great meter. I saw your back light stay on and I dug around in the manual and discover how to turn off time-out on the back-light, yours does so I figured a way to make is so. Thanks for the accidental bench tricks. Take care.
On another note, I notice that your are not using the Agilent U1253B OLED display DMM anymore in you videos. I have read the the display fades out over time and loses "brightness". Just curious if you have experience this problem with that DMM. I was looking for a second DMM and found the U1252A for a good price and I like the color blue, because I a nerd...lol
Paul, could you explain all of your thoughts about the troubleshooting techniques you used in this video? You "immediately" jumped into measuring the "stand-off" resistors looking for voltage drops, but never said why. I _think_ I know why, but I'd still like to hear your (complete) explanation of why you jumped to checking for voltage drops, etc. Great video showing fast ways to troubleshoot a partially working radio!
I think he said/implied that the resistors standing off the board are usually off the board because they are the ones that get hot in normal operation. (Therefore they are the ones most suspect for having burned out due to overheating.) He localized his search to the area around the tube that was the coldest, because it should normally be warmer that that. Since there was a resistor that was both near the cold tube, and elevated off the circuit board, it was the most suspect component. Checking the voltage drop let him see if it was allowing a reasonable amount of voltage through to the tube. It was not allowing practically any voltage through, so it was again the most suspect component. (e.g., if there is +250 volts on one side of the resistor, and -1 volt on the other side, no voltage is going through the resistor, and a resistor feeding voltage to a tube should have a much smaller difference in voltages from one side to the other). That was my (simplified) understanding, anyway - for what it is worth.
Wonderful fix on the radio. Like the probe fix with the insulation. I use a Probe set by Huntron (MP-10 Microprobe set) Part# 98-0078. They work good on circuit boards and are fully insulated up to there tip, and can be extended to get in hard to get to places. My go to meter is a BK Test Bench 389. I'm also on your Patreon channel.
Its amazing how quick you nailed down the problem Mr Carlson before even locating a schematic. Knowing where to look from years of experience saves a lot of time. Just like when turning it on you already knew the audio section was working becase of the buzz. Its nice to know there are possibly 300 Volts lurking inside the radio. I'd heard that of the old TV's but had long forgotten it since they've been out of service for so long. This is awesome stuff. Thanks for sharing!😀 😃 I love the baby blue eye that tells you when your dialed in.
We've got a Telefunken similar to this (a "Concertina" model, the case is more boxy in shape though). Used to listen to it at dinnertime back in the 60's. The issues you described here sound very much like what I remember being the problem with ours the last time it was turned on. But since that last time it was used was probably 25 years ago, and from watching your videos I know I shouldn't even try turning it on again. Unfortunately I don't have the setup to repair it myself. And since we are trying to clear out the house and downsizing our collections it's better for me to just sell it on to someone who will enjoy restoring it.
Excellent video. Very entertaining and informative. Thanks. If I may, can I request your next diagnose and fix be one of those 6 volt, solar powered, motion detection, 60 LED yard flood lights that over time don’t turn on or off when they should. Think of the thousands of people you’d be helping!!
Back in the '70s, I was an ET on the Sosus system in the Navy. I was calibrating some Western Electric audio amps ( freq range 1000 hz linear all the way down to dc). Sosus was all about very low freq, I got a taste of B+. I will never forget that feeling! I enjoy your channel. Thank you. KB4ZUS ( check out Sosus on Utube,,all unclassified now, actually was a pretty cool job.
Always good stuff from Mr. Carlson's Lab When I saw this I thought "Maybe a FM IF alignment", but not.... Also I looked on Patreon for one FM IF alignment , but cannot find one. Cheers
![Blox Fruits Dragon Rework Update [Full Stream]](http://i.ytimg.com/vi/EqDAp8udhm0/mqdefault.jpg)
As you said, “see how distorted”, and turned it up, I totally expected it to catch a station from the 50’s! I wish that it did.
My father was a EE working on radios for VEF in Latvia before being "repatriated" during WWII, spending the last year of the war doing the same at Telefunken. Aside from the PCB, the radio reminds me of many he talked about. I'm not sure when they went from "chassis wiring" to PCBs - surely after the war, and after he came to the US. Thanks for jogging my memory about dad's work, and spending hours with him in his electronics lab, learning things like how to bias tubes, and soldering. We put many Heathkits together even before I was old enough for my first science class in school.
I think he'd have been proud of you, both for your skill as a diagnostician, and for saving an old Telefunken radio.
Warmest regards!
Thanks for taking the time to share your story, and your kind comment too!
Always a good day when Mr. Carlson uploads a new video! You sir are the "Radio Doctor" and a Canadian national treasure!
Mr. Carlson for Prime Minister
@@christopherlong2301 he's amazing isn't he. Blindingly intelligent and a master at electronics. So impressed. I'd love to know one millionth of what Paul knows
I bet Mr. Carlson knew exactly what the problem was from the moment he tried to tune in a station. He just went through the motions as a teacher would so as to not look arrogant. That's the kind of guy he is I think. It's getting hard for him to maintain the modesty because we all know how good he is at his craft.
Seems like it. He seemed to zero in on it being a resistor problem right away. I would have figured the usual bad cap.
@@christopherlong2301 it was recapped, seems reasonable to assume something different doesn't it ?
It’s all like smoke and mirrors
I'm old enough to remember the fading days of the USSR, but it still surprises me every now and then when I see something like "Made in West Germany." Gorgeous unit, and I hope its owner gets good use out of it now you've fixed it.
THAT was TOO easy! And Telefunken, one of my favorite electronics companies of all time. Too bad they do not still manufacture tubes. But the russians manufacture high quality replacements.
Thanks for sharing this beautiful radio with us. Clean it up and it will look like new again.
A very similar radio sits on a shelf at my grandpa's place, nobody turned it on in ages after I explained that it needs restoration to work safely and good.
This could be a good occasion to make it sound again. Thank you for the inspiration!
How did it go?
Ive got a 1951-52 "Metz" radio from West Germany that is this same design. I'm looking forward to getting it up and running! Thanks Mr. Carlson!
You're very welcome James!
This show was great, short and sweet. Sorry, I am not an electronic person (did help my dad build a Heathkit Stereo receiver and amplifier as a kid) and some of the stuff you talk about is over my head. I do like old radios and such and it's nice to see someone who knows how to work on them. Thank you!
Glad you enjoyed it!
Great to see you back, Mr. Carlson. Missed seeing your videos.
WHAT A KOOL OLD TELEFUNKEN RADIO RECIVER MR CARLSONS LAB
MR CARLSON YOU HAVE KOOL VIDEOS
Back in the day real radio repairmen never carried schematics with them because it was all inside their heads.
Years of learning by doing and (of course) studying electronics we see by Mr.Carlson's example that saying still holds true today. Great video!
A lot of those older chassis had a printed schematic inside the rear panel. I have successfully repaired a few…. Thanks to these.
These are the most helpful tutorials for these tube radios I have ever seen. Big time, Thank you.
Glad to help!
Slightly off topic, but thanks to this (and some other) channel(s) I repaired my first active speaker set. I recognized 3 PCBs: a 'power+amp' board, a control board and a small inputs board.
Since I had already recognized the characteristic 50Hz hum that was quite loud at power up and faded after a second, I had actually identified the problem before even opening the box. The power section had 2 beefy 3300uF 35V caps of which only one (as if it was intentional, to help a novice see the difference) was bulging at the top. I replaced both. (Panasonic=ok?)
This channel helped me identify the sections, know the function of the caps, be aware of the risks - especially in the power section - and therefor gave me the confidence to try this repair.
So thanks Carlson's Lab!
(I also want to thank Murphy for keeping me alive and for not giving me the hardest problem, but actually the ideal beginner's project.)
(For other beginner's reading this - I had already done some digital Arduino stuff, so not a complete beginner, but power-supply and amps are really a level up. As in, level up on the death-wish list.)
It would be fun to pit the best RUclips technicians against each other in a race to diagnose the problem in the same radio. I know who I’d put my money on! Always a pleasure to watch you work, Paul.
Mr Calson, Shango066, curiousMark, glasslinger, bandersontv
Every time I start one of your videos I think there's no audio. Then your voice booms in loud and crystal clear. Amazing microphone.
Finally a German radio on your channel i was waiting for that
Thinking the same thing, germans made good tube radios. I hope he owns a Saba automatic with remote control :-D
@@georgegherghinescu Saba Freiburg or Freudstadt?
@@domi7007 Freiburg is the most desirable automatic I think.. motorised volume control, buttons light up when pressed, push pull output stage and large good sounding speakers. Those germans at Saba really went above the rest, there was nothing like it. Meersburg and Schwarzwald where the other automatics from memory. Freudenstadt was just like Meersburg but without the automatic search function.
@@georgegherghinescu True. Freudstadt was pretty good too though!
@@domi7007 Agreed! I don't own an automatic but I love my '56 Freudenstadt :-)
Dear Mr. Carlson , I too like many others become inspired by your videos and impressed by your electronic knowledge ,
I thank you sincerely for lessons that I received through your videos.
You are most welcome!
YES! The "Tube Master" teaches!!!
All the best Paul,
Patrick
My parents bought one of these new in the 50s and they still have it! I haven't turned it on in years, looks like I need to clean it up and see how it goes. I was always impressed with the bass on this radio and I loved the "Jazz" button, how late 50s can you get!
Nice old, what 1960s era receiver, that was probably quite an investment in its day for the first owner.
My grandparents had that very receiver--first time I've seen it in about 30 years. Thank you!
As a child growing up in Uganda in the 1960's my family had a Telefunken valve radio and I have vivid memories of the dials, buttons, strange writing of musical notes and the 'Hi-Fi badge. Made very good audio and was pleasant to listen to. Then, in around 2017, I saw one come up for sale online here in New Zealand and I had to have it. It looked a bit similar to the one we had all those years ago so I got it. The seller was retiring and he must have been a radio technician as he had a number of valve radios and parts for sale.
My Telefunken set is not working , does not power up (from what the seller told me) and I don't want to dabble into it as I do not know anything about radios and their circuitry. Would have sent it to you if I was closer.
"That's the problem with intermittence - this thing might all of a sudden start working and we won't have our culprit"
I wish more people understood this in the context of computers as well. Software can be the same way - I always used to say when I was doing desktop support that restarts DELAY the problem, they do not fix the problem. If we take some time to think and investigate we can at least find out what's happening even if we can't fix it (it can always be fixed, but generally it'll be the software vendor who has to do it at that point, in that context). The only saving grace of PCs is generally there is an event log that might help you figure out what's going on.
It's awesome to see that the same sort of thing exists in other contexts and in other technologies, and maybe some awareness should be brought to this concept.
That said, between you, Mr. Carlson, and finally having the time to watch the new one from Ben Eater it's a good week!
Was working on a Powerbook 100 Power supply and I was getting like 11v somewhere i should have had 165. Traced it back to a 1ohm 2 watt resistor. It looked fine, but measured open. Replaced it and bam, back to life.
Great video, i have the same radio in my living roon I picked up from a flee market a few years ago. It is still working fine. But now i have an idea where to look when it will fail in the future. Thanks for that. Greetings from Germany
Inspired by your videos, I've started a restoration project on a WWII era Canadian General Electric G-62 receiver that somebody was throwing away. Aaaaand what I thought would be a "restoration" (the laminated wood chassis isn't in too bad condition), turned into a near complete rebuild. The wiring insulation was all crusted to crap, crumbling as soon as I handle it, and the sockets were getting pretty brittle. Most of the resistors have drifted out of spec. The electrolytic, foil, and paper caps are getting replaced, as you'd expect, but most of the black mica's are still within spec. A few mica's have cracked housing and one has a broken-of lead, so I'm just ordering enough parts to replace everything but the pot, tuner, valves (which seem to be good, near as I can tell), trimmer capacitors (which are all still good) and what looks to be a precursor to ceramic capacitors that still seem to be within spec, so I'll leave those alone. Got the schematics, so it's like building a kit from scratch!
My grandmother had this exact radio and I remember using it a lot as a kid.
I had one that was my Dad's Telefunken, Junked it from ignorance. Now I rebuild and refurbish tube radios. I love to hear them come back to life. They have character, Where the new Chinese ones DO NOT. Micro circuits, Yuck !
Yep, they're great for kids as long as the kid doesn't have access to a screwdriver. I was a terrible kid. I had the back off everything. How I didn't kill myself, I don't know. My very worst experience was taking apart a fully wound dumpster 7 day carriage clock. It's human nature to wind a clock up as tight as you can to see if all that extra energy will make it come to life. But, if you dismantle a fully wound mainspring, it's literally like a bomb going off. The energy in those springs can cut fingers off and whip eyes out of their sockets with no effort at all. I was lucky and learned very quickly from my mistakes that reading about what you're thinking of doing do can prevent some very nasty accidents.
A new video from Mr. Carlson......Telefunken Awesome!
Knowledge. One resistor, but finding the problem is what knowledge does for you. Nicely done.
Those valve radios with PCB's in them really make me laugh. That was around the time they were being replaced by transistor radios around 1960. Am I right?
I also wonder what happened to speaker manufacturing, The number of times I power up a very old speaker to find it's 100% better than a modern speaker surprises me. They used to weigh a ton, but they had fantastic bass resolution and warmth.
When I still repaired tube radio's mostly in the 60's my first look inside was to identify resistors having blackened their code rings. Only wire wound resistors remain more or less the same even when overloaded, but carbon and metal film alike do this. After checking and in most cases just renewing these and watching out for condensors connected to them as potential failure origin, lots of problems did not need further sorting out. I was not aware German radio construction moved to printed circuit boards in the time of the Noval series of tubes in the 80's series (like the EBF one mentioned here), The last German one I repaired was our own Blaupunkt with both Rimlock tubes from the 40 series and one strangely out of place metal (wartime?) tube the EAA11 for the FM decoder. Its RF tube used in the FM section doubled as a AF preamplifier tube feeding to the powertube EL41. It took awhile for me to understand the tiny circuit diagram glued in the wooden case: who would think of such doubling solutions! In any case this way of minimising the number of tubes while introducing FM reception still resulted in an expensive unit, which always had a lower performance in the FM decoder and could never be correctly adjusted over varying signal strengths. BTW at the time we got this radio as a present in 1952 or whereabouts, FM broadcasts were not even live in Holland at the time....
Nicely done! Troubleshooting with your fingers to check tube temperature and guessing it was B+ voltage open circuit somewhere is art as much as science. Telefunken made great equipment and it was so pleasant to hear that deep resonant sound come out of the speaker. Bravo.
Thanks for your very instructive videos and it's good to see that you can fix a tube radio with only a multimeter! I was a teenager in the 70's and trying to fix old radios (tubes and transistors), I wish there was RUclips back then 😂😂😂
8:27 . . . When test equipment can kill you! A service contractor who looks after our UPS systems was at a different site and had a Fluke meter fail in such a way and thought a 370 VDC battery bus was de-energized, and started dismantling the hardware to replace the batteries. And arc flash explosion occurred and has was in the hospital with burns to his face and arms, damage to his eyes, and off work for months. Even good quality test equipment like Mr. Carlson's Agilent can suddenly fool you with a wrong / frozen reading. Always use care. If it's something that could be lethal or explode, use a second tester.
I have seen the videos on YT when the DMMs are tested for very high voltage surge survival - I was quite surprised that many didn't make it.
Kudos, that was too easy for you! I haven't seen a cheater cord for over 55 years! Thanks for sharing.
"There's a lot of music around the FM band, and you know what that means...." Yeah I know, punishment.
Very fast repair Paul, nice.
I had some difficulties seeing the little black electrolytes. In my memory that was part of the solid state era, not vacuum tubes. Must be entering the new times here.
My family has had this same model of Telefunken since it was new. I think it was serviced once in the late 80s, but is still running very well. Neat to see the interior of it and how it (should) work!
One resistor later , a bassy lovely radio fixed ....again your Wizardly knowledge of electrickery won yhe day .....
Thanks for these videos, I love them. I'm a complete beginner trying to learn some electronics and enjoy them all and learn what I can. Much appreciated!
Paul, there's another way to check resistance in circuit with solid state equipment. I watched a video from diodes gone wild and he used the MESR-100 ESR Meter to check for a shorted transistor in a switch mode power supply that had a snubber network and an inductor in the circuit, a multimeter would have fallen over in this situation but the ESR meter saw the inductor as an open circuit and he was able to check the resistance without removing anything!
I have never seen anyone use this technique before!
Once I saw that! It couldn't be unseen! LoL now my ESR meter has a second purpose in it's useful life!
It's not a win win situation but it's definitely a win more often situation... Having the ability to test components in circuit makes life so much easier!!!
Thanks for your time and effort that you put into every single video! I'm not a big fan of radio! But I watch every video that you put out with anticipation as do most people.. the TV's in my house have become obsolete, no one has used them over the last few years!
Had this sort of content been provided on TV, RUclips wouldn't have become what it is today! That's Lamestream media for you LoL...
Mr Carlson you are good at electronics restoration of vintage shortwave radio Receivers and Aliament
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
Mrcarlson, I would be honored to join your patreon page. A year or two ago, I become a patreon, and I think I unsubscribed after a week or two. At the time I was more interested in partying than studying. Anyhoo, I believe that you blocked me from accessing your page. If you care to unblock me ill gladly join at the 5$ level. My account name is Juan Cervantes. As a beginner in electronics Id appreciate the entry!
Hi Paul long time no see
I find these instructional videos satisfying and addictive. Reminds me of decades ago when I was being trained in electronic diagnosis and repair on very similar circuitry.
Another awesome video Mr. Carlson! I have the exact model Radio with schematics. I bought it some years ago from a guy in the Netherlands. He was a dealer in tube radios.I tried the radio and I was not happy with the sound. It did not sound fulsome. It gradually sounded distorted to my ears. I was planning to send it to Radio Doctor for fixing but I changed my mind. I am in Canada. I still have the radio secured in a box and I am planning to have a look at it one day. Thankfully, I have and isolation transformer and a variac. Someone who used to work tube equipment suggested that it might be the rectifier.
Thanks for taking us along, I really enjoy the ride.
Its been a lot of years since I’ve been inside electronics on a regular basis. This reminds me of how much I’ve forgotten or never really knew.
Thanks for the class.
Best wishes to you Uncle Paul, hope you and family are well
A new video from this channel always makes my day. Thanks Mr. Carlson!
My pleasure!
Like the shorter videos, easier to fit in to my day.
Great to see old equipment brought back to life. Very nostalgic.
i am glad to see you back Mr Carlson i really understand more about the older vacuum tube radios in the way you explain it in your videos you are good at what you do nice job
Mr Carlson your vintage Telefunken shortwave radio Receiver is cool
I love the thought process you used to diagnose this radio. Thanks for another interesting and entertaining video. 73
Mr Carlsons lab your vintage Telefunken receiver is cool 📻 😎 👌 👍
nice radio to see good old day's thank you.
Thank you for taking us all along repairing the radio. Nice work fella too. Good day too.
"It will stop me from shorting anything" It sounds like this was learned from experience!
Been there, done that. Nothing like sparks flying by shorting something out.
@@AstrosElectronicsLab ...and destroying a probe in the process
@@christopherlong2301 yep haha
This video is so serendipitous because I have recently purchased the same brand radio but a slightly different model that has a tuning eye. though the radio works I would like to clean and inspect it and I would very much like to thank you and your channel for helping me with a lot of radio projects.
Glad to have you here!
What a gorgeous radio. Big thumbs up.
Nice work! A good demonstration and lots of information. Keep doing that. Thanks.
I love the quality of the voice track on this video, well produced clear and obviously recorded on high end equipment comes through clear on my phone
Yoyr the man Paul. Huge fan I learned so much watching your videos. I'm more into rf amplifiers but actually learned to love audio amps from you. And im going to become a patron this week as well. Greetings from the state of Maine my friend
Thanks Paul. Nice radio. It seemed like a fairly easy fix....but then again, your are a master with these things. Let's see what you'll bring us next time! Cheers
Listening to this through some 6J1P-EV vintage Soviet military tubes in my headphone preamp. Recording quality sounds fantastic.
Nice looking radio from 1960.
Nice to see a new video Professor Carlson and one on a good old tube radio. Many thanks for the post.
That was a nice troubleshooting catch, your experience shines through. It's nice that you didn't even have to take the chassis out of the housing.
Glad to have you back! Very nice looking radio, my wife asked right away if I could get one in our living room :) We have a WEGA 209 in there now, but I think with age we tend to like older styles better. Thanks for the great video! I would remove the caps on the transformer right away, they look like one old type of Wima's, they fail miserably with time.
They were replaced by Nichicon caps hiding behind the metal bracket. The original caps were completely un-hooked. They also changed the rectifier.
@@MrCarlsonsLab Why the hell did I think you missed those?! :D
I fixed a Phillips multiband and it nearly drove me mad. The IF adjustments crumbled to the touch...so I stopped touching them! Works ok, but wow, those European components were literally foreign and it was packed tight like a watch. Beautiful dial though, but...never again. Thanks, Mr. C!
Thanks Paul, nice 101 troubleshooting 👍🙂
Thanks for stopping by Dave! Always look forward to your video's as well.
Hey Paul absolutely cool to see you working on european radios. I am a well today was my birthday so I am a 19 year old student who is basically fixxing these radios. The big problem of east german radios and czechoslovak TESLA radio is that they were wired for 120/220V. Today main voltage is 240 and it just absolutely torches stuff inside with the voltage raise.. Gotta say you are the biggest inspiration to why am I collecting obsolete old JFET stuff with pilotlights :D . I have quite extensive experiences in repairing TESLA radios and it's nice to see your hated waxies getting dumped. We have our own version of that too brown pressed crappacitors that overtime crack open and or asphalt caps which I call chewing gum caps..lots of fun things. I was at one point considering doing the same you do with youtube. I do a lot more than just radio repair. I design SMPS audio amps both tube and transistor and a lot of PCBs. Well definitely looking forward to your next video :)
Also- judging by the board style radio construction this might be very late 1960s and early 70s era
Nice to see you survived the ice storm and happily touching a couple of shielding cans that could have a different tension 🙃
Good job...done a lot of restorations on the channel, but never a Telefunken...
Excellent demonstration of safety procedures and basic diagnostics.
I tended to use a highlighter when following very busy schematics. If something gets messed up, the page can always be reprinted/recopied 😄
Great video! I have two of these Telefunken small radio's in the European version (with station names on the dial-glass). They are cute, aren't they? One of them I restored for our teenage daughter. She also uses it as amplifier & speaker to play mp3s via the PU/gramophone input.
Great troubleshooting, Paul, thanks. I'm sure I wouldn't have been as fast. Also, I too, often put heat-shrink on my probe tips, or use the screw-on covers that usually come with them, but the finger guards often can't go around nearby components. Watching this video finally convinced me to order some 7" pincer probes for my DMM. Thanks again!
Dear Paul, your audio sounds great, would you make a video of your chain of recording? Great videos I enjoy them a lot thankd you for your effort! Well this was a short one :)
Greetings from Kuwait Mr. Carlson.
I have the same radio in my home in Sri Lanka.
Today I have learned something from your valuable video which will be useful to me in the future.
As always I thank you for your great videos
God bless you
Take care
Hi Paul, great video as usual. You have my same DMM Agilent U1252A, great meter. I saw your back light stay on and I dug around in the manual and discover how to turn off time-out on the back-light, yours does so I figured a way to make is so. Thanks for the accidental bench tricks. Take care.
Glad to be there Gary!
On another note, I notice that your are not using the Agilent U1253B OLED display DMM anymore in you videos. I have read the the display fades out over time and loses "brightness". Just curious if you have experience this problem with that DMM. I was looking for a second DMM and found the U1252A for a good price and I like the color blue, because I a nerd...lol
@@MrCarlsonsLab Glad to have for the education Paul.
I had a U1273A and the OLED faded to the point I could no longer read the display in normal light. I replaced it with the U1252A. Great meter.
Paul, could you explain all of your thoughts about the troubleshooting techniques you used in this video? You "immediately" jumped into measuring the "stand-off" resistors looking for voltage drops, but never said why. I _think_ I know why, but I'd still like to hear your (complete) explanation of why you jumped to checking for voltage drops, etc. Great video showing fast ways to troubleshoot a partially working radio!
I think he said/implied that the resistors standing off the board are usually off the board because they are the ones that get hot in normal operation. (Therefore they are the ones most suspect for having burned out due to overheating.) He localized his search to the area around the tube that was the coldest, because it should normally be warmer that that. Since there was a resistor that was both near the cold tube, and elevated off the circuit board, it was the most suspect component.
Checking the voltage drop let him see if it was allowing a reasonable amount of voltage through to the tube. It was not allowing practically any voltage through, so it was again the most suspect component. (e.g., if there is +250 volts on one side of the resistor, and -1 volt on the other side, no voltage is going through the resistor, and a resistor feeding voltage to a tube should have a much smaller difference in voltages from one side to the other).
That was my (simplified) understanding, anyway - for what it is worth.
Wonderful fix on the radio. Like the probe fix with the insulation. I use a Probe set by Huntron (MP-10 Microprobe set) Part# 98-0078. They work good on circuit boards and are fully insulated up to there tip, and can be extended to get in hard to get to places. My go to meter is a BK Test Bench 389. I'm also on your Patreon channel.
Wow, simplest radio fix in I don't know how long. Excellent, informative troubleshooting, thank you. Also a stunning radio, such quality. 😊👍
The genius fixes another old radio
Excellent video, trouble shoot and repair! My humble thanks. 👍
Its amazing how quick you nailed down the problem Mr Carlson before even locating a schematic. Knowing where to look from years of experience saves a lot of time.
Just like when turning it on you already knew the audio section was working becase of the buzz.
Its nice to know there are possibly 300 Volts lurking inside the radio.
I'd heard that of the old TV's but had long forgotten it since they've been out of service for so long. This is awesome stuff. Thanks for sharing!😀 😃
I love the baby blue eye that tells you when your dialed in.
Thank you ... I look forward to every vid .... always fantastic troubleshooting! Great job!
A nice quick fix! Cant say I'm surprised that you figured it out...
Thanks for sharing.
Excelente Trabajo de reparación.
Saludos desde CUBA.
Enjoying the Professor’s videos!!!
I wish more than anything that just once I could finish a job that lands on my bench in 30 minutes. Another excellent tutorial, thank you.
We've got a Telefunken similar to this (a "Concertina" model, the case is more boxy in shape though). Used to listen to it at dinnertime back in the 60's. The issues you described here sound very much like what I remember being the problem with ours the last time it was turned on. But since that last time it was used was probably 25 years ago, and from watching your videos I know I shouldn't even try turning it on again. Unfortunately I don't have the setup to repair it myself. And since we are trying to clear out the house and downsizing our collections it's better for me to just sell it on to someone who will enjoy restoring it.
Excellent video. Very entertaining and informative. Thanks.
If I may, can I request your next diagnose and fix be one of those 6 volt, solar powered, motion detection, 60 LED yard flood lights that over time don’t turn on or off when they should. Think of the thousands of people you’d be helping!!
Interesting suggestion. I will keep that in mind.
Back in the '70s, I was an ET on the Sosus system in the Navy. I was calibrating some Western Electric audio amps ( freq range 1000 hz linear all the way down to dc). Sosus was all about very low freq, I got a taste of B+. I will never forget that feeling! I enjoy your channel. Thank you. KB4ZUS ( check out Sosus on Utube,,all unclassified now, actually was a pretty cool job.
Always good stuff from Mr. Carlson's Lab
When I saw this I thought "Maybe a FM IF alignment", but not....
Also I looked on Patreon for one FM IF alignment , but cannot find one.
Cheers
Thanks for sharing the troubleshooting process, have a nice day
It was nice to see one European radio! Thanks a lot!
Glad you liked it!
Yay! another episode of Mr. Carlson's Lab!!! 😊👍
Good thinking makes for a simple repair :-) I thought you might also check the alignment, but it does depend on the scope of the repair.
i love the intros to these videos i really enjoyed the yeasu ft-1000mp repair :)
Thank you so much..
I enjoy the videos, but seeing the dust on that radio was activating my allergies.
Keep up the good work.