Transistor Radio Repair: Logical Fault Finding

  Рет қаралды 15,813

George Christofi

George Christofi

Күн бұрын

Ever wondered how to start to fix a radio? If you follow the basic steps you should be able to narrow down the fault fairly quickly and easily with a bare minimum of test equipment Logical fault finding is a useful skill to develop so you can work more efficiently and not do work that doesn't actually need doing. Transistor radio repair is very satisfying as a hobby but you can end up chasing your tale if you just approach things in a haphazard manner. A transistor radio circuit diagram may look like a real jumble of lines and symbols but once you get the hang of it you can follow the lines and match them to points inside the actual radio.
I only use basic tools, most notably a signal tracer which you can buy ready made, build from kit or even from scratch. Other tools are a power supply, audio generator, and some basic hand tools.
This particular video is me using a Hacker Herald RP30 radio which was bought from eBay as spares or repair. Taking into account all of the parts used the repair cost less than £3 and around an hour and a half on video. Without filming it would have been quicker. A novice will take longer but the more you do, the better at fault finding and repair you become.
The links mentioned in the video are below for the signal tracers.
AllTheGearNoIdea : • K7000 Velleman Signal ...
BD Electronics Kits: • DERB - The BDST-1 - Hi...

Пікірлер: 83
@dougmcartin3881
@dougmcartin3881 2 жыл бұрын
Well done George. I love the descriptions on Ebay as to condition. It's even better at the Ham swap meets when you ask the seller if the radio works. He says, "It worked the last time I used it." What he neglects to tell you is the reason that he stopped using it. Namely that it went on fire the last time he used it and it's never been used again. 73 Doug.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
That's the rub isn't it. Why did they really put it away. On broadcast sets it could be the lack of FM but probably not, more likely it was too expensive to throw away but cheaper to buy new than repair the old one.
@daleburrell6273
@daleburrell6273 Жыл бұрын
...speaking for MYSELF- I actually look for transistor radios that don't work, because I know how to FIX them-(!)
@matambale
@matambale Жыл бұрын
One of the best videos on a logical path to fault finding I've ever seen, thanks George. Would say that the AGC on that probe would drive me nuts - but then, so does constantly having to reach for the volume control on a manual one.
@andybbeck2043
@andybbeck2043 2 жыл бұрын
George this a super video George I really Enjoyed this .has given some confidence to try fix one with not much tools
@Codeeze
@Codeeze 2 жыл бұрын
Nicely done George. Logical fault finding can be highly illogical at times, but in the main, it's the sequence you show here in your video. A basic test equipment setup is all that is needed, nothing flashy, and needn't be expensive. As you know, I have also started exclusively using different transistors, more commonly available than those that are the norm, and to great effect. Nice nod at the end there to Chris' latest video - did make me chuckle 😁
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
You know me, sense of humour with an irreverent streak. It's mostly common sense but logical makes life easy!
@YouAllKnowBob
@YouAllKnowBob 2 жыл бұрын
I've said it before and I'll say it again, you have a lot nicer old radios on that side of the pond! Great teaching video!
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Many thanks Bob. Some are nicer but you had better designs on your tube sets than just brown boxes.
@keithbrandaw7229
@keithbrandaw7229 2 жыл бұрын
Hi George, like the direct strait forward diagnosis. Thanks for the stream , entertaining!
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Tried to do a straightforward, no faff run through of how to see whats faulty. Us old hands can sort of do it in our sleep but newcomers might just take one look at the insides and give up. Thanks for watching it Keith. All the best.
@acestudioscouk-Ace-G0ACE
@acestudioscouk-Ace-G0ACE 2 жыл бұрын
Another great video and greatly appreciated. As a newbie to this sort of thing, this very basic tuition is learning gold to me. I really appreciate it.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Glad you enjoyed it, Really should do more basics videos really because I think they will appeal to more people starting out, not just the old hands redoing the same thing over and over.
@acestudioscouk-Ace-G0ACE
@acestudioscouk-Ace-G0ACE 2 жыл бұрын
@@GeorgeChristofi That would be a good idea...otherwise you are preaching to the converted! Whereas there are lot of people who are interested but may lack confidence to ask in case they look stupid. I'm a photographer by trade and from teaching, I know what is obvious to people who have been in the trade for years, is a big hurdle to newcomers. Little things like which wires from the Hacker's battery leads to connect to with a power supply. Obvious to you, learning gold to me!
@bparker86
@bparker86 11 ай бұрын
Loved the editing on the finger motion mate 😂
@TonyAlbus
@TonyAlbus 2 жыл бұрын
Nice step by step debugging and repair George!
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Thanks Tony. Logical fixing is better than blind luck!
@jimnewman5596
@jimnewman5596 2 жыл бұрын
That was a great troubleshooting video on that radio George, I didn't know that a simple change out of the germanium transistors with silicone transistors would work without a change of biasing.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Hi Jim. I think both Roberts and Hacker radios have such broad tolerances on the transistors that pretty much anything will fit. The ideal is low noise higher amplification devices and you just have to match that with voltage ratings of the devices. I could have fitted Russian germanium but I'm hanging onto them for now because the guitar crowd love them in effects pedals.
@Radiocruncher
@Radiocruncher 2 жыл бұрын
Great instructional video George and nice bit of fault finding. The usual suspects again. Nice use of silicon without re-biasing though. Signal tracer was interesting as not seen one of those before. Cheers Graham
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Glad you enjoyed it, Just thought I'd go back to scratch. The signal tracer is the same as Pauls one, the ELV Bausatz Mini-Signalverfolger MSV1. Unfortunately, since brexit they don't ship to the UK any more. Take care, All the best!
@lukabread4099
@lukabread4099 2 жыл бұрын
This video came just in time beacuse i got a old radio and the switches got bad contacts and now it works, ill try fixing another one too thanks.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
It is a great hobby to get into. It can throw curveballs at you for obsure faults but generally once you get to find your way around you will find it interesting and fun.
@ided2419
@ided2419 2 жыл бұрын
This video really helped me on my transistor repair 👍👅
@greggsvintageworkshop8974
@greggsvintageworkshop8974 2 жыл бұрын
Great video George! Very systematic troubleshooting technique and great results. Thanks for a great video!
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Many thanks Gregg. I see so many people just assume what a fault is without actually testing properly.
@SoddingaboutSi
@SoddingaboutSi 2 жыл бұрын
Rohde & Schwarz? Name dropper! Cheers George, nice wireless. None of that Roberts crap.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Had to name drop, just in case people were unsure who makes decent test gear! Almost as much fun as repeating current limited power supply!
@Theoobovril
@Theoobovril 2 жыл бұрын
A great instructional video, George...sooper-dooper.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Thanks. I thought it needed a no faff radio fix video to show how easy they are to diagnose and repair.
@allthegearnoidea6752
@allthegearnoidea6752 2 жыл бұрын
Great video as always George. I like your description of the typical ebay listings. Those band switches are definitely one of the very common failures. Best regards Chris
@allthegearnoidea6752
@allthegearnoidea6752 2 жыл бұрын
Thanks for the channel plug. Regards Chris
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
If it isn't band switches or volume pots its got to be caps and af11x series transitaters
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
@@allthegearnoidea6752 No problem!
@Backtothefutureradios
@Backtothefutureradios 2 жыл бұрын
Hi George! Good to see another video…..not sure you have noticed or not, but sometimes those “paint” dots are actually spider poop….For years I thought that every radio was near someone painting until I noticed that there were those spots beneath long lived spider webs. Great tips on testing…..love the term “jiggery pokery” Thanks for sharing…Take Care-Larry
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
I hadn't noticed that and spider poop makes sense. That radio new would have been nearly £30 which then was pretty much 2 whole months wages before tax so having it in a room where you were slapping paint around would not have made sense. Think I'm going to do a few more basics type videos to help newcomers in the fixing game rather than just teach old hands to suck eggs! Nothing like a bit of jiggery pokery to make it work! all the best Larry, take care.
@terryblackman6217
@terryblackman6217 2 жыл бұрын
This was the perfect video for the beginner. Brilliant. 👍😊
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Glad you liked it.
@LarryDeSilva64
@LarryDeSilva64 2 жыл бұрын
I never saw one of those Hacker radios over here in the states. The other one they fail to tell you in the EBAY description is that the power supply was removed from the radio. Rubbish capacitors and non functional transistors always a good rule of thumb and yes I do have a thumb that is one inch shorter than the other. Yes all very good practical steps to diagnose a radio George. There are illogical ways but those normally produce sparks and magic smoke. Thanks for sharing George always a pleasure.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Many thanks Larry. If you do see one in the US then grab it because there was only ever one export model. There are very few of them left at all! With a lot of British sets, they use the AFxxx series of transistor and they are prone to growing whiskers internally that short the can to the junction. It's a good idea to tap them and you can get the radio back to life. Also, capacitors... Certain brands are change on sight these days. Neither of those will diagnose a blown speaker or faulty power switch!
@thehappylittlefoxakabenji8154
@thehappylittlefoxakabenji8154 2 жыл бұрын
very nicely done George nice track repair I usually save all my LED legs for making links and track repairs
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
I just use whatever is lying around on the bench... There is always something and in the event I have actually cleared up, I have rolls of tinned copper wire for the job!
@thehappylittlefoxakabenji8154
@thehappylittlefoxakabenji8154 2 жыл бұрын
@@GeorgeChristofi so Have I. I even have a full Roll of tinned copper wire I got from maplins still unused !
@simon7030
@simon7030 Жыл бұрын
As a novice I have learned loads thanks for you great production.
@harveysvintageaudio
@harveysvintageaudio 2 жыл бұрын
Hi George, great vid.
@kyawmyoehtwe5503
@kyawmyoehtwe5503 Жыл бұрын
Thank you for learning
@old64goat
@old64goat 2 жыл бұрын
Nice job on tracing out the radio George.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Many thanks Bill. Hope you are feeling better now.
@ided2419
@ided2419 2 жыл бұрын
Thanks!
@senhuan
@senhuan Жыл бұрын
Very nice video. I am fixing a Philips Jenny de Luxe 250 90RL250/22R.
@masoudmontazery907
@masoudmontazery907 Жыл бұрын
Good luck sir 🎉
@jormamannikko4304
@jormamannikko4304 5 ай бұрын
What silicon transistors did you use for replacing the germanium ones? Thank you of good informative video.
@kendom33
@kendom33 5 ай бұрын
Great video George. I've a dead (lights up) roberts rp60. Would you have a video on those? Cheers, ken
@madrafboy
@madrafboy 9 ай бұрын
Excellent video. I have a substantial collection of transistor radios from the late 50's to the present day. Quite a number of the Roberts have failed AF117's and I have tried a number of fixes e.g. cutting the shield wires or zapping with 50v. I wonder if you would be so kind as to recommend the suitable silicon transistors that you use. I am an electronic hobbyist but lack the experience to choose a suitable silicon replacement. Thanks and keep on giving helpful advice!
@geetasingh6463
@geetasingh6463 7 ай бұрын
Where did you bought the probe?
@raceingdemon6464
@raceingdemon6464 2 жыл бұрын
Great Video For People Who Are Just Starting Out At Trying To Repair These Old Radios George And Very Clear And Informative George Wonder Were You Can Buy Bobs Signal Tracer Kit I See You Did Not Put Any Of The GT322Bs in It But What Silicon Transistors Did You Use With Out Altering The Bias ? Yep !! Nice Eduactional Video George Regards mike.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
I just tried some old if PNP transistors that I had lying around and they worked fine. As for Bob's kit, there should be a link to the video and the website description is in Doug's description.
@trevorflynn1520
@trevorflynn1520 Жыл бұрын
Would you know why the volume would just go straight from low to high on its own on my radio.
@GeorgeChristofi
@GeorgeChristofi Жыл бұрын
That normally is a faulty volume pot that would cause that fault.
@Steveuk405
@Steveuk405 2 жыл бұрын
A lot of Germanium Transistors will have to be replaced with Silicon as the Russian Transistors are not available now, Good Video. See you at Golborne I hope.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
I'm hoping to be there Steve, see you before you start your new life.
@Neraxia
@Neraxia 2 жыл бұрын
Does "destructive testing" 07:13 involve the use of a hammer and why was an adjustable wrench used instead of that? Please elaborate.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
The adjustable wrench was the closest thing to hand. The idea is to break any whiskers of tin that have grown inside the transistor can shorting the junctions to ground.
@Christophers-Assorted-Stuff
@Christophers-Assorted-Stuff 9 ай бұрын
@@GeorgeChristofi I discovered that you can use an electric toothbrush or vibrator to shake off the whiskers. It seems to do a better job than tapping.
@GeorgeChristofi
@GeorgeChristofi 9 ай бұрын
I do have a chinese made 'facial massager' which I have tried but with little success. These days I find it easier to put low noise silicon transistors in them instead and dump the germaniums.@@Christophers-Assorted-Stuff
@joeramanno7742
@joeramanno7742 2 жыл бұрын
Hello George nice work on the hacker where can I get the signal tracer thanks JOE
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
That tracer is an ELV MSV1 which you can get from amazon or ELV direct but only if you are not in the UK. Since Brexit ELV will not ship to UK or Northern Ireland.
@joeramanno7742
@joeramanno7742 2 жыл бұрын
@@GeorgeChristofi thanks for your quick reply George in your opinion is the msv1 a good signal tracer where do you get your capacitor from that you use on the hacker radios thanks Joe I live Canada T
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
@@joeramanno7742 I really think the MSV1 is possibly the best tracer I have. Having both a signal level meter and an agc circuit means you can just use it and hear the signal without having to play with the volume control. My capacitors usually come from Farnell which is part of the Element 14 group. I can buy cheaper from China but the shipping time can be a problem. I usually buy 200+ of each value to bring the costs down.
@daleburrell6273
@daleburrell6273 2 жыл бұрын
20:48...it might be a good idea to bridge the trace(s) running parallel to the trace you are fixing-(!)
@driverfilmsshortwavechannel
@driverfilmsshortwavechannel 2 жыл бұрын
Bloody AF117s.
@GeorgeChristofi
@GeorgeChristofi 2 жыл бұрын
Yep, Blooming rubbish they are!
@simonmaclennan677
@simonmaclennan677 3 ай бұрын
Can you really just put Silicone transistors into a radio like this without panicking over bias arrangements etc??
@kennethiman2691
@kennethiman2691 10 ай бұрын
Strange T shirt. Reading is fun with a pentangle?
@GeorgeChristofi
@GeorgeChristofi 10 ай бұрын
Its a play using old nick himself reading one of his books. I guess reading is good, regardless of the author or the subject!
@MPBLeadbetter
@MPBLeadbetter Жыл бұрын
Sent radio to radiocruncher. He will reair radio with correct test stuff.
@GeorgeChristofi
@GeorgeChristofi Жыл бұрын
I have better test gear than radiocruncher. I can also work faster!
@harrybond007
@harrybond007 11 ай бұрын
The radio sounds terrible, I don't think it's working properly, after you say it's fixed, noisy with poor reception.
@GeorgeChristofi
@GeorgeChristofi 10 ай бұрын
As I say in my videos, the workshop is pretty much a faraday cage here so all of the electricals that are in the room during filming pretty much wipe out any signals that do get through the sheilding. There is only a local AM transmitter which shut down a few months ago now and the FM transmitter relay for one national independent that gets through the walls here.
@steve732
@steve732 Жыл бұрын
Lose the PINK Hair man !
@GeorgeChristofi
@GeorgeChristofi Жыл бұрын
It's ok, it's been various colours since then. Currently blue
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