Electronic Circuitry Diagnosis And Fault Finding! [Repair]

[@chinchan9]

He could get paid hundreds of dollars an hour but chooses to teach us, Thank You Mr Carlson!!!

[@MrCarlsonsLab]

You are very welcome!

[@hans429]

Mabey not a day but hundrets of dollars a year...anyways...yes!!!

[@tedmoss]

Or at least 200-300 thousand US a year. That's why I am a Patron.

[@vernonsmith5465]

Would love to see this radio restored!!

[@jessiecastille204]

I agree, Thank you Mr Carlson

[@wansolve289]

I went to a Vocational High School in 1969 and took Radio & TV Repair. It was a half-day class with academics the other half. Learned Electronics Theory and Tube operations. Semiconductors were introduced in our Junior year. The Instructor was a Ham Radio Extra Class and he encouraged us to learn code and pursue a License. I never opened a Radio/TV Repair Shop but it was great training for getting an Associates in Electronics Engineering in college. Since then I’ve repaired/restored hundreds of old tube radios. It was a breath of fresh air discovering Mr Carlson’s Lab and getting the urge to clear off the old workbench and fire up the soldering iron again.

[@terminalpsychosis8022]

Absolutely this old piece of art needs to be restored. This isn't even a question.

[@peep39]

This is my favorite style of video that you do. Using diagnostic tools, along with educational explanation and application example, and an approach of looking from the outside in. I learn so much from watching these. I love it

[@kheangtang12]

Song Khmer,

[@michaelmerta8956]

Please bring it to new and replace everything to new it is worth it. The outside of the radio is an lovely display of an gone by area, love it. Please bring it back like new.

[@twicebittenthasme5545]

I remember going to the drugstore around the corner from my house to test the tubes for our Dumont tv. It was one of my favorite things to do as a little kid! That tv didn't last long between the foil on the eventually broken rabbit ears and the constant "give it a whack, son" so the family can watch The Jackie Gleason show or Sky King. It got to the point the little round screen would not stop fading away until it finally became a blank. Pop said the flyback's days are done. Asked how he knew and he said the Simpson told him so. It took a couple of years before I knew what he was talking about. Thanks for the memories! And yes, I believe that "box" should be given another go! They are vanishing from the world and that looks like it become a museum piece! Excellent video. Thank you for sharing!

[@Maadhawk]

This entire channel, and others like it, are why we need to preserve our right to repair the things we buy.

[@rootvalue]

1:03:35 gave me goosebumps. Eureka moments like that are rare on a tech bench. I love these “live troubleshooting” videos. Thanks as well for the auto-generated captions. You’re the best.

[@bigmac965]

I would love to see you do the restoration on this old radio, Mr. C! There's a magic about these old pieces that the new stuff just doesn't have, including the beautiful cabinets they're in. Thanks for sharing your knowledge!

[@sgit1]

The days of tube radios and televisions provided good jobs for repairmen - and many did not possess your knowledge. They accumulated so called tricks of the trade. I remember the ads in magazines - learn radio/TV repair at home. I attended RCA Institutes back in the day - wish you were one of the teachers.

[@Barracuda48082]

Rotc school..?

[@Barracuda48082]

I still have my tv, radio training books from 1954, prior to color tvs. The manuals and cyclopedia look fairly new, red hard bound and embossed..treasure of history and knowledge.

[@sgit1]

@@Barracuda48082 The RCA Tube Manual was the "bible" back then.

[@scubadoc7100]

Hey Paul, this is another great video. I love the way you teach and fully explain what you’re thinking and why. You are a tremendous teacher. I vote that you do a full restoration on this radio. I always learn much watching you troubleshoot and restore equipment and radios.

[@genestatler2514]

Yes, please Mr. Carlson restore it. I'm from that era and I love those old tube type radios. Thanks in advance.

[@pupdog7374]

My parents bought a brand new Zenith television (B&W of course) back in 1952.. As this TV aged, its vacuum tubes would fail. My dad would then pull all of the tubes, put them in a paper bag and give them to me. I would hop on my bike and head over to our local drug store where I would do exactly what you described and test the tubes one by one. Ah, the memories.

[@gurunatrajannatrajan9846]

Your videos are brining me to those days around 1972 to 1980.This is the period for all tube Radios of those early times. As a technical person of that period with roaring practice in Servicing of those tube radios, I feel happy to see your videos. THANK YOU.

[@qzr0jt]

I've viewed this one two years later. Just found you only recently. If you've repaired this old Fada already, I'll find and view it too. I'm grateful that you're doing these videos.

[@bradleyleben7785]

The radio has survived in this good of quality for 80+ years I say yes go for a full restoration. Your channel is my go to channel to see how these old jewels of history are repaired. I often wonder was these radios listen to to get the news during WWII. I know my grandparents stayed glued to theirs at that time. My two uncles were in Germany.

[@frankpitochelli6786]

Reminds me of my early yrs 1978 .... When people repaired everything. I miss those days in the service business. Great job and thorough explanation.!!

[@jptucsonaz8503]

Yes! Let's RESTORE IT! nice looking unit with shortwave, sure; why not.

[@TheLawrenceWade]

Absolutely beautiful little radio from a great but long-lost American brand - Fada. They made lots of beautiful and high-quality Bakelite radios in the day. This one, an early AA5 prototype, a pre-WWII radio, you know someone saved up for a while to buy it, and in its service life it was playing news of World War II, and probably well into the 1960s given one of the capacitors we saw under the chassis. Its physical condition is about as good as you can get without finding it NOS in its original box. It has been both lucky and well-loved all its life. When I restore something like this, I save all the original parts and tuck them into a baggie somewhere in the chassis, just in case the thing ever ends up in a museum.

[@jlucasound]

@@TheLawrenceWade Good idea, Lawrence, and considerate. It will one day tell a "story" to a future generation. Nice.

[@jlucasound]

I Concur! Really! I mean, it is so Compact! It's a keeper. He is going to have to straighten out that grill cloth. :-0

[@MichiganPeatMoss]

Nary an enthusiastic viewer is in a position to say "No". :)

[@InXLsisDeo]

M. Carlson is so astonishingly knowledgeable about old electronics that it's like he was already around in the 1920s.

[@philipburrows]

Hi Mr Carlson I think that the radio is a beautiful candidate for your magical touch of restoration.

[@superrodder2002]

I lived 1 block away from an electronics repair shop. As a teenager I would haul tubes from old tvs and radios in there and he had a tester right in the showroom where I would check all the tubes. He would always take time to answer my questions and teach me stuff.

[@kharakim]

This should give you a laugh. I learned electronics fundamentals in 1957 in radar maintenance school at Keesler A.F.B. Of course, I understood the theory of vacuum tubes, but their operation was always something of a magical mystery to me-how they actually do what they do. Well, you killed all the magic and mystery. Your clear explanations and actual illustrations of the working parts of tubes has brought it all down to earth. I now know the mundane reality of how they work. Where's the fun in that? Thanks, as always, for your fine teaching. It's a real public service.

[@tesmith47]

Yeah I was at keesler in1965 got a good education in electronics I was a 30545

[@erikdenhouter]

:) I had the same experience of disappearing magic when Paul explaned how a shop worked at 9:33.

[@davidmckenzie1046]

Fantistic ,You are terrific for sharing your knowledge. I wish you had been around in my younger days. In my time people would not share their knowledge.It was always kept very secretive to make people think those in the know were geniuses.REAL BARSTEDRY.Thank you very kindly I will watching more of you.

[@vineethramaraghavan5856]

This man tells more than I learned in my college..

[@atthefarm3269]

Yeah vineethramaraghavan5856 I agree, my EE curriculum consisted of microprocessor programming and discrete linear transformations

[@JerryEricsson]

Years ago, back in the 70's I was in the US Army. I cross trained into Radio Teletype, after first cross training into land line teletype. One of the rigs I learned on was a huge old transmitter/Duel receiver set called the 26D rig. It was so large that it took a 2 1/2 ton truck to haul it around, and we towed two 10KW Generators to power her up in the field. Part of the shut down procedure of the transmitter was to take a large tool that resembled a rubber sword with a hook on one end, and a large clip on the other. You had to find a solid ground, then open a special door on the transmitter housing, that contained the huge vacuum tube you spoke of. With the grounded rubber sword, you hooked that top cap and discharged the tube, it had several thousand volts present, and could ark a bit when discharging. The old 26D was neat in that you could transmit on almost any frequency, including standard AM. In Vietnam, during the war, many communications soldiers would tune the transmitter to around 800 on the AM, hook their little Pioneer PL 50's or reel to reel sets to the radio and run pirate radio stations for the troops. Soldiers loved it, they used to have a saying, the only happy troops are bitching troops, and man those pirate's did a lot of bitching, but they played the cool rock of the anti-war crowd and that was very popular, especially with the draftee's.

[@CandyGramForMongo_]

I’ve been lazy watching KZbin all day. By far, this channel has the best sound. Go figure!

[@pierremartel3552]

He has a radio voice. and very good mike. I am sure he cut some high just enough, something like 8k and up.. I also think that all the equipement he have is his lab kind of remove all the echoe as they are not even and wont reflext noise as much.

[@InXLsisDeo]

@@pierremartel3552 Also Paul Carlson is a perfectionist. The lighting is also pretty much perfect.

[@TinyMaths]

Agreed. I was thinking that although I have little knowledge about what Mr Carson is explaining, it's so soothing to listen to his voice, articulation, enunciation etc, but then it also occurred to me just how good the sound quality is.

[@TheLawrenceWade]

The Mister Rogers of Radios. Paul knows what he's doing. :) He's not out there with Go-Pro cameras and a million angles, he's just someone with a real natural talent for sound and lighting and videography - and editing - and a real natural talent for repairing electronics. I can name the tubes as he points them out with the slight error (50B5 versus 50C5) and I don't need the routine lecture about AA5 safety - but he has to do it so no one gets killed and no radios get destroyed. Yeah, I spent a Friday night watching the Mr Rogers of Radios repair an AA5 while there's an RCA 88-T, a Grundig, and a Nordmende on my service bench. (God forbid I should try dating...) I love what he's doing. Thank you, Paul, from a fellow Canadian.

[@dadawoodslife]

When I studied electronics at college they said 'you'll never see valves anymore so we skip that from the course'. 20 years later I get presented with a valve circuit in a job interview. 44 years later, here I am, finally learning how to diagnose those circuits!

[@a587g]

Definitely deserves to be restored. Very good, clear explanation of troubleshooting; narrowing the problem down to the section, and isolating it to a specific component with voltage measurements. Nicely done.

[@timgregerson612]

Thanks for the accurate analysis of this old radio, Paul. I have a 1937 RCA 10” Kinoscope Model# TC-1. I assume that the tc stands for television chassis. It is in working condition, but after watching your videos on restoring old radios, I will definitely build a Carlson superprobe and go through it and replace all the old “waxies!” The TV was given to me by my dad who ran a radio repair shop in Milwaukee back in the 1930’s, so it has a great deal of sentimental value to our family. Thanks again!

[@GBS1043]

It's also worth a lot of money

[@johnt7502]

Our electronics teacher taught us to keep one hand in your pocket when field testing tube gear. By all means, restore. The case alone is worth it. Many period radios and TVs depended upon the cardboard back of the radio to protect you from shock. Maybe you can locate a photo and recreate one. Great video, looking forward to the future restoration. 👍

[@SteverRob]

John T in addition to the cardboard back, there were as few and inaccessible metal points as possible, usually 4 screws underneath. All knobs and switches are plastic/Bakelite.

[@dennisisham1989]

I like the testers and the explanations. They make things understandable without any confusion. Thanks!

[@MrCarlsonsLab]

You are welcome!

[@RANDALLOLOGY]

This video brought back so many memories from back in the day. When I was young, I remember going with my grandfather to the Recall drug store to a RCA tube tester. He would check his tubes and the ones that said bad or weak, he would get new ones. That intrigued me so much that I wanted to learn electronics. When I went to high school I took as many electronic classes as I could. I cut my teeth on vacuum tubes and moved up to what they called transistors. Later in life I got a bachelor's degree in electronic engineering. Nowadays it's IC chips ,5 volt supplies, and all Digital. But I miss the old days. Lol

[@Geezer1955]

Textbook troubleshooting techniques, bravo! Just replace the shorted cap. Use the radio everyday, when the next component fails take us through the procedures again! I learned a lot from this repair.

[@anno250]

When I did my Advanced certificate in Electronics ,nearly 40 years ago one of the students just couldn't leave thing alone tried testing a radio with the Oscilloscope and didn't listen to the bit about live chassis and cause an almighty bang that blacked out one wing of the Tafe building and blew a hole in the front of the oscilloscope . So thats stuck in my head about using a isolation transformer. Funny thing was up till then the teacher was sticking things up on the board that we destroyed ,bit hard to stick an oscilloscope to the board .

[@MrCarlsonsLab]

Thanks for sharing your story!

[@SteverRob]

We had a “tree” about a foot tall made up of soldered together failed components from repairs and fubars over the years. We called it the “burning bush”

[@jungoogie]

This is really humbling to see some care shown to these pieces of electronic history.

[@lem1962]

Another great well spoken thoroughly explained video and I’d be glad to sit and watch you do a complete restoration. I watched this video rather than the Cowboys game. Keep up the good work.

[@Rev22-21]

I watched the game and later found this. Wonder if I just saw the last game Witten and Garrett are going to be w/the cowboys. Been a boys fan since 1965. Looks like i'll be pulling for N.O. & Brees(?) this time. Chances too, it may be Brady's last rodeo too. Oh well. The sugar bowl is my next watch.... Baylor wins I hope. Happy New Years!

[@lem1962]

That’s great news which I’ve not heard yet. Disappointing season to say the least. Glad their staying on as well.

[@timothysobina6777]

Good choice.. forgo the Cowboys game! Ha!

[@1mJustCurious]

It's been a very long time, 48 years to be exact since I last troubleshot a vacuum tube radio receiver and your video brings back good memories in high school. I love how detailed you are in explaining the signal tracing process and it is very effective! Thanks for sharing your trade secrets! More power to you Mr. Carlson!!

[@MrCarlsonsLab]

You are welcome!

[@paolocanali3361]

Nice story about end users that find and replace the bad tube by themselves, and it is absolutely true. When I was a kid, the radio broke and the next day my father came home with a bag of tubes, borrowed from the local radio/tv shop. It unplugged the radio from the socket, opened the back of the radio, and exchanged the tubes with the spares one by one, until the radio worked again. It was a history professor, and far removed from any technical work. But repairing the tube radio by replacing a tube was something that was confident to do.

[@garybalanesi610]

I like this guy! He's quite a storehouse of knowledge.

[@thomashowe855]

He is *the* storehouse of all humans know about electrical repair and function. Incredible, really.

[@robertmandell526]

I've got BS/UCLA and MS/Caltech in EE. None of my Profs 50 years ago were as clear, concise, and instructive as this fellow. Cost to troubleshoot and maintain phased array radars would have been much less if Mr Carlson had written the TS manuals.

[@telwood15]

and more.

[@alexkay1874]

Love the style and circuit of this radio a must for resto

[@jlucasound]

Agree!

[@deadfreightwest5956]

Indeed. This is a quality set.

[@edwardallan197]

Pretty gripping troubleshoot! . He connects all the dots, I learn a lot!

[@markphilpot4981]

It would be both educational and fun to see this radio receive a full restoration. Much like others you have done, this radio is in grave need due to how dirty it is and the state of some components. Your other restorations have been great fun to watch and I think others and myself would like to see this one done also. I look forward to seeing you do this and I am sure the other viewers would to. Happy Christmas Mr. Carlson! Blessings come to you in the new year!

[@moshezaharia4666]

A very well built radio like this deserves a restoration.

[@jamespfp]

The worst thing about long-form videos is how long it takes to make them; I can say from experience that every minute of video footage takes about an hour's worth of post-processing effort, if I include the render times at the end, and so forth. *BUT* the best thing about them is how excellent they can be, and how interesting. Thank you for your dedication to sharing information with others.

[@allthegearnoidea6752]

jamespfp I make videos your right and the quality requirement and time is ever increasing

[@jamespfp]

@@allthegearnoidea6752 I certainly wasn't joking or exaggerating about the ratio I stated. 120 minutes of video takes 5 days to properly edit, depending on the number of cameras, cuts, audio tracks, and the rendering happening while sleeping. 120 hours is 5 days.

[@allthegearnoidea6752]

jamespfp I’m definitely agreeing. Just spent a week making a not particularly good video myself

[@hawkinscsa]

Yes Sir, please do a full restore. This is an excellent video. Thanks to You, this is getting much easier to understand! The way you followed the signal through the radio was great!

[@chrisnorton1245]

Mr Carlson. Great video sir. Again thank you for explaining the safety aspects of working on vacuum tube equipment with a possibly live (hot) chassis. looking at the circuit of the audio output stage and the failed wax capacitor, assuming that it was in a dead short condition, (which the scope-meter indicated) I would be very suspicious of the 240R cathode bias resistor. In the fault condition I reckon that resistor would be dissipating around 1/2W (based in the 10.6V fault voltage between the 25L6G tube cathode and the chassis). I bet that if you unwound that failed cap you would find that the dielectric had failed internally causing the burn mark on the side. If you are inviting votes for restoration, I vote do it. I have worked on vacuum tubed equipment before but I have not come across anything as early as the 1930s. Personally I have never seen a "Ballest tube".

[@kenhammond3810]

I restored my dad's radio, an Automatic Radio 613-X, that he had when he was a kid in much the same way. I listen to it every day. I've restored a could of others since then. But you've shown me some new tricks. Well done! My latest project is my father-in-law's aviation band radio that we rescued from the basement of his childhood farmhouse in western Kansas, it was full of mouse nests, but will soon be working again.

[@quicktastic]

Yes on the restore it question. Always like seeing that.

[@chrisbridge3175]

Hi Paul, I'm also an experienced technician and ran across your video by chance. I have to say that you are by far one of the most technically accurate presenters, and you use a heavy dose of common sense. I can't tell you how much I support your efforts and how you are doing this. There is far too much mis-information and terrible examples of how not to do things. Please continue doing what you are doing, and on behalf of one tech who is sick of cleaning up after hacks - thank you!!! -Chris

[@MrCarlsonsLab]

Thank You for your kind feedback Chris.

[@samuellourenco1050]

Thanks, Mr. Carlson, for sharing your knowledge. Learned a lot with this video. Your probe works a treat and is great for troubleshooting.

[@josephrott1920]

Please restore it. I love your channel as it is the only electronics channel I have found that deals in pre transistor era tech. The engineering of such electronics is quite different than modern tech and is becoming a dieing art. The things you talk about and do are very important for historical documentary purposes. Thank you for your work.

[@billpowell5931]

Very nice presentation (as usual) to get this radio operating. I believe a complete restoration would be great. I love the vintage radios.

[@general5104]

THANK YOU for going thru the print and comparing it to the various spots in the circuitry. I wanted to take Electronics, when I was a kid, & talked my Dad into letting me take Electronics in a local technical school (night school), while I was going yo High School, in another part of town. After the class started, we didnt have but 5 in our class. I was the youngest at approximately 16. The oldest was in his 50's. That was in about 1965. The Dean came in and said there weren't enough folks in the class to constitute it a class so tgey were shutting it down. We could either get our tuition back or choose another subject. Machine Shop was available, so I took that. I took that type course on up thru college level & turned out to be a fairly decent Machanist, but my true love of electronics was never explored. I'm dang near 70, now; and am STILL trying to figure out how stuff works !!! I just happened upon your site, (it was in my "pull pile"), and am going to watch as many of these as I can. You talk like you know what you're talking about !!! Thank you, again. One question: Since a transistor is just a switch, controlled by a smaller signal on one leg, how does it work like an amplifier? I CAN'T make it make since.😜 Bill, from Tn., 🇺🇸

[@michaelbarg5582]

Thank you for yet another highly instructive, professional video, Paul! Yes, please restore this vintage radio. There is still much we can learn by following your thorough troubleshooting and practical restoration process. I wish you and yours' a very safe and Happy New Year!

[@spudhut2246]

Enjoyed the video and the detailed troubleshooting. You are a master of all things electrical. Thank you for making these videos.

[@XRoadie1]

Welcome back, Paul! I was afraid you had called it quits. I always enjoy your thoughtful approach to troubleshooting. Best regards!

[@tbriglia01]

Thank you Mr.Carlson . You are a God send explaining the process ! There are a lot of us out here who can make a repair but, very few can answer how and why. The how and why,in my opinion are very important. I am an extra class amateur radio enthusiast but struggle with some of the formulas . My technical journals are books from the 20’s and 30’s along with some old magazines from ARRL and some others. I love your lab !

[@dougrobison5342]

Well done Paul, you do a Great job explaining everything. Thanks much!

[@MrCarlsonsLab]

Glad it was helpful!

[@charleskosina4799]

I strated servicing valve (vacuum tube) radios after school way back and got quite familiar with the techniques. One popular radio was a Philips portable with a 1.5V A battery and two 45V B batteries in series. The most common fault was the output transformer open. This was because people took them down to the beach and the salt air corroded the winding. We had to keep a stock of the transformers in the shop to keep up with the demand. Apart from modern electronics that I work with I still am given old radios to restore. The oldest was an1933 Astor Mickey, which actually still worked. All the valves were functional!

[@MrCarlsonsLab]

To learn more about 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

[@paulSmith-in5wq]

Looks like a good radio to restore

[@josephsirois2353]

Gee .. it looks as though test equipment is not an issue, for you,thanks for another great video , 🥳

[@josephsirois2353]

Could you do a video on converting an old all American 5tube into a CW transmitter??

[@ericdumptee9084]

Sure, its a nice set, restore it !

[@marcoalfaro6313]

yes restore it also i have an HH Scott LT 110 Tunner that i would like to restore, are you interested on doing the restoration

[@springwoodcottage4248]

Fabulous how with a single snip it jumped back into life, makes one appreciate how components have improved & everything become so much smaller in the eighty three years since this was made & also how nearly everyone is now decoupled from the slightest understanding of how things work & how to resolve faults. Thanks for sharing!

[@DanCalloway]

I remember checking vacuum tubes at the local drug store. Hard to believe that we had to do that. I would like to see this radio fully restored to factory condition. Thank you for a great video and wonderful learning experience.

[@JerryEricsson]

Indeed, when stationed at Fort Myer in the HQ Communications section officers and senior NCO'S with radio or tV decided that should be in communications, so they would bring them in and ask (read order) us to repair. They would cover the parts and most would slip us an extra ten spot for our trouble, way cheaper then taking them to a tv repair shop and paying 50 bucks to have the device opened up, plus parts and a rather high labor. We would pull the tubes out, walk across the street to a drug store and use their testers or some times just dig out our Government tube tester and check them, then buy the needed replacements keeping the receipt and fix the sets. We did have a trained radio mechanic in the Section and he would take care of the bottom problems after calling the owner and telling them that they would have to cough up another 20 bucks for his service. Most acquiesced. It was a fair sideline for some of us.

[@rabindranarayanchaudhury7313]

Thanks Mr.Carlson for imparting the knowledge of Radio repair.

[@MrCarlsonsLab]

You are very welcome!

[@andrewjones6693]

Great troubleshooting, Mr. Carlson! I would like to see the complete restore. There's nothing better than well-cleaned and well-lit old radio dial! 💡 I also enjoyed the Realistic external speaker! As a former employee of Radio Shack, it caught my eye immediately! 😁

[@algratz760]

Enjoyed this way of re-learning this type and method of troubleshooting. Thanks much!

[@MrCarlsonsLab]

You're welcome!

[@algratz760]

@MrCarlsonsLab I would love to see you fully restore this old radio. I too used to work with technology such as this when I was in Tech school years ago and then got into 2 way radio troublshooting later in a factory in Minnesota. . I still love the process of analysis and trouble shooting. It just intrigues me so much.

[@scotthill2230]

Of course you should restore it so it can be in service for another 90 years.

[@roberthibbard6508]

The

[@deathlywraith2282]

If I had a lab/shop like yours, that is where I would be almost all of the time. While in high school went to Vocational Technical school for Electronics 1971-1972 then Data Processing 1972-1973. Computer Programmer job paid the bills while electronics hobby kept me off the streets - most of the time. Now retired and keeping busy doing nothing all day - still have not finished. Please keep on making and posting these videos. Thanks again for sharing all the fun stuff. Always plan on a great day - just in case it happens!

[@Counselor77]

I remember the good ol days when I went with my Dad to the store with a sack full of tubes for the TV and using the tube tester.

[@silenthill4]

/s

[@Counselor77]

@Robert Slackware That tube tester is worth its weight in gold, my friend.

[@Watchyn_Yarwood]

My mom and dad owned and ran the country store/post office in our tiny little town. We sold everything from pencils to horseshoes AND radio tubes! I learned at about the age of 10 (mid 1950s) how to test and replace tubes. Folks would bring their radios in, I would test the tubes and sell them new ones when needed.

[@gbennett58]

My Dad sent me to the drug store to test tubes. In addition to testing the tubes, I discovered you could get a thrilling electrical shock by hooking up the probes to your fingers. Wouldn't do that now, of course.

[@davidlegault9745]

@Robert Slackware Check out Glasslinger - he makes tubes.

[@aos3971]

I was servicing this type AC DC Operation radio on 1985. When the polarity of AC input changes it use to give current shock if we touch the chase or even control knobs.. I Enjoyed the audio quality on those days. As up to now i never heard such beautiful audio. This is from India. EL84 and ECH 81 vacuum tubes i used to replace on those days.

[@bobvines00]

Paul, here's my vote for a restoration, with your detailed explanations as you perform it. Like many other commenters, I remember walking into drugstores with tube testers close to the front door. As a kid, I remember looking down into our TV through the grill at the lit-up tubes and feeling the heat rising from them. ;)

[@erin19030]

Ive been fixing radios since the 1950’s and never saw a real hot chassis like this. Most of the radios were consoles and operated with power transformers that isolated the line voltage. The AA5 had what I called a semi hot chassis because they had two ground circuits a floating ground and a chassis ground that was isolated to some degree by a .1 uf cap with a 220k resistor across it. Only now after watching this video do I completely understand the concerns about hot chassis on an AA5. The AA5 is a safer chassis on its own but requires an isolation transformer when connecting other pieces of equipment to it

[@dgretlein]

You are absolutely correct about the tube testers being in the drug store (my memory is a grocery store). I remember, being 10-12 years old in the late sixties, opening the back of our family tv, pulling the tubes, riding my bicycle to the grocery store and testing the tubes. I don’t recall whether I found the the replacement tube. “Thanks for the memories ...”.

[@MultiJennifer54]

i did too with my dad, he took by the hand to make sure i wouldn't touch electrical equipment, then later i started going on my own, push lightly and turn tube till it would drop down into it place, beautiful technology for days gone by. i then learned not to push tube but to align the notches and wham in she went, great days of a people that were at the beginning of radio tech.

[@tedmoss]

Currently, I am restoring a 1936 Pilot model 203 export model made in Long Island, NYC. I started working on radios when I was 9 years old in Edison, NJ. When I was 10 I had my own business repairing radios and later on some TV's. I needed the money to support my hobby flying R/C model planes. The battery's were two 67.5 Volt and one 1.5 Volt for the transmitter. They were very expensive for a kid in 1953.

[@MrCarlsonsLab]

Thanks for sharing your story Ted!

[@radiorexandy]

I vote for restoring it completely. While you're working under the chassis you might as well replace that ballast tube with some suitable resistors as it's only a matter of time before that tube goes.

[@BruceNitroxpro]

Andrew Rood , Or, get some great idea of how to sub some other low filament tubes to match the 25 volt ones and drop in a little filament xfmr.

[@marknash7113]

Another fine job of troubleshooting. This circuit is a great example to restore. Great job reminding us that you can bring even series filament radios with original caps up on the variac and dim bulb limiter and find the problem(s) before wasting time and money on shotgunning things. You may have to anyway, but if the iron is bad or coils open your in for way more work than its worth. Keep em glowing!

[@volvo09]

Looking forward to this! I love following fault tracing.

[@Ira06002]

I’m Fascinated by the AA5 and radio repair/restoration but new in my learning journey. I’m so amazed of your knowledge and pragmatic approach. Great video!

[@nviduumde3497]

You know you'll get quality content and an extremly high grade of knowledge when Paul uploads a new video. All american 5s are always a great topic to learn something. Great work. keep it up!

[@BruceNitroxpro]

Nviduum DE , But this was before the all American 5 sets. Review the section about the choke placement.

[@ricoma6037]

Thank you! I really enjoyed going through this with you!!!

[@LakeNipissing]

*_HAPPY NEW YEAR, PAUL_* Thanks for sharing so much knowledge with us!

[@anno250]

It feels good getting one of these to work again . I've just restored two old Australian Kriesler radio's .A 11-20 and a 11-28 . Not sure if these were sold over there but they were made in Australia . The 11-20 was a real challenge as slugs or something like that took a liking to paper caps and ate the outside of the caps right down to the foil. Good thing I got a circuit diagram to find their values. Replaced all the paper caps and the electrolytic caps and a couple resisters that had gone open and it fired up. My biggest issue has been when someone has been into it before and used the wrong value caps as well as some wrong value resisters . Yeah it may work but not very well . In the mid 1970's there was well I've heard them called mustard caps where ever I see them I can just about guarantee their the wrong value. The improvement in sound quality speaks for itself. Oh on a suggestion for a topic ever tried replacing the dial cord now there's a test for patience .

[@phillipyannone3195]

I would love to see that radio restored to its former glory and probably beyond. I would also like to see a video on mr. Carlson's rendition of replacement of a curtain burner line cord. Have a happy New Year!

[@chrisnguyenDQ2012]

Yes. Let's go! Restoration! We're in the digital world now but you brought us back to the day that non of us was born. I guessed it's gonna cost you more money and time! Thank you very much

[@ke4est]

Paul, you have once again done just an awesome job, in explaining everything so well! Hope you and yours have a great new year!

[@alikhan7903]

the stuff he was using to hear that noise? one is speaker connected to that white box and from the white box he got that testing equipment do you know the names of them all?

[@ke4est]

@@alikhan7903 Yes. That is the Carlson, super prob! All the plans to build one is on his Patreon page. I have built a couple, they work great!

[@johne6081]

Thank you for taking me back to my undergrad days, when I earned my tuition working in the audio service department of a ham radio and hi-fi shop ca. 1970.

[@fredfeldmeier8228]

Of course Mr. Carlson.. we all enjoy the superb quality & knowledge of expertise.. keep up the good work.. Thanx for the video.. happy new year 2020.. God bless..👍👌

[@konradpetz7317]

I'm a 40 year retired industrial electrician. One of my lines started up in 1960. Has ad several upgrades over the years. The original 1950s electrical/electronics equipment that was still left in place has outlasted the the 1980s equipment.

[@johnopalko5223]

I'm _always_ in favor of a good restoration video. Nice to see a good old pentagrid converter tube.

[@McTroyd]

Of course it should be restored! FIX ALL THE THINGS. I could use a refresher on peaking up the receiver sensitivity... just bought my first one to try fixing up, based on years of watching this channel. It's so weird to have a manual say something like "the newly-allocated FM band" and find out the radio is the same age as my father. LOL

[@wireworks616]

Great video. I could actually hear the radio saying restore me. Yes.

[@henrikkliebhan4874]

So relaxed, so professional. Stay alive with your channel🙏

[@TheUniversalEyes]

Wow, Fluke Scope meter, did Mr. Carlson treat himself for Christmas? :)

[@aslerunarborgersen5175]

I am sure it was a Christmas present from his kind wife :)

[@adam7868]

I've used that scope meter, it's getting on a little in age but it's still excellent for its age

[@InXLsisDeo]

If I were Fluke, I would give it for free.

[@frankpitochelli6786]

Those scope meters are 1500 to start.. What a difference from the old CRT scopes. Now I want one..!!!😊

[@adam7868]

@@frankpitochelli6786 they're completely isolated from Mains so you can work on high voltage power supplies as well as switch mode power supplies, ide reccomend you buy a fluke or a Tektronix, don't settle for cheap

[@theduckisok]

Happy New Year! I enjoy these old school videos. I'm not much on surface mount, but anything from 1915-1965 is my forte. Tom

[@cat-lw6kq]

The way he describes the past I think he actually went back in time.

[@tomdouglas8945]

Definitely would enjoy watching you restore this. All of your videos are very educational!

[@greengrayradio1394]

Nice, thorough explanations as always! I heard the "LU" beacon, seems it is in Abbotsford, BC. In some of my own radios I have left some caps, but the paper ones seem always bad and leak. I vote for a restoration!

[@robertborchert932]

Hehe, that beacon is close, very clear. Remembering my Morse code as a Cub Scout.

[@boydbailey6332]

Yes, I would really like to see the complete restoration. Thanks for all your great videos!

[@reo52]

Yes, restore it and make the safety modifications while you're at it.

[@johnmarchington3146]

I'd love to see that radio restored and I love your diagnostic tool. It's brilliant.

[@richardwright2461]

I worked at Radio Shack in the early 80s, and we still had a tube tester and tubes!

[@waltschannel7465]

One of the store managers at the time in my area told me that Radio Shack had a goal in the 1980s of being the last tube vendor around.

[@randallculp2414]

Same here lol

[@randallculp2414]

Early 70s. High school.

[@225rip]

Brought back a lot of repair memories, enjoyed this video.