Vintage Sunmark AM FM Transistor Radio Repair A Tough One To Diagnose

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  • Опубліковано 28 лис 2024

КОМЕНТАРІ • 191

  • @volvo09
    @volvo09 2 роки тому +46

    "I have a really cool resurrection tv set on the bench that I'm afraid will turn to dust if I move it"
    You really know how to get us excited

  • @billharris6886
    @billharris6886 2 роки тому +6

    Thanks Shango066 for sticking with it until you figured out the problem. I have actually seen this problem before more than once. The silver paint on those dog bone caps actually oxidizes away, reducing the capacitance which, in your case, caused the IF to oscillate (as verified by the squealing). Even though those IF transformers are so low cost, the quality is surprising good (when they are new of course). The internal capacitor is actually matched to the coil's temperature characteristics, resulting in minimum temperature drift in the finished product. The coil Que is also surprising good for how small coil is.

  • @chetpomeroy1399
    @chetpomeroy1399 2 роки тому +45

    The apparent oxidation on that tiny tubular capacitor actually *did* look like silver-mica disease. Even though this was a low-budget receiver, I believe this was *more than* worth the effort because of Shango's ability to demonstrate his formidable troubleshooting skills. Through methodical trial-and-error, he logically deduced it down to this tiny component.

    • @Suddenlyits1960
      @Suddenlyits1960 2 роки тому +1

      I object your honor! That calls for speculation on Mr. Mason’s behalf. What are Mr. Masons qualifications? Has Mr Mason proven himself a qualified expert in the field of electronics? How do we know the capacitor didn’t fail BEFORE silver mica disease set in? Your honor,I request that Mr Masons comments be stricken from the record until such time that he can provide this court with adequate proof qualifying him as an expert in the field!
      Sorry,Just kidding! ,I agree completely with you. I saw your Perry Mason profile photo and couldn’t resist playing “Hamilton Burger” for laughs. I should know after all these years that Perry Mason is always right.

    • @chetpomeroy1399
      @chetpomeroy1399 2 роки тому +1

      @@Suddenlyits1960 LOL! Both of our profile images and your UA-cam handle are *definitely* period-correct regarding the Prosecution's statement!

    • @Suddenlyits1960
      @Suddenlyits1960 2 роки тому +1

      @@chetpomeroy1399 Thats true! I had just watched Perry Mason the other day on one of my predictas.. The episode had Noah Berry jr and Strother Martin in it. Noah Berry jr was accused of marrying a woman and then killing her to inherit her estate. It was odd to see him in a role like that after years of seeing him portray Joseph “Rocky” Rockford, Jim Garners dad on The Rockford Files. He was always trying to talk “Jimmy” out of his dangerous job and into truck driving.

  • @JerryEricsson
    @JerryEricsson Рік тому +2

    Man you would not believe what that squeal does to my hearing aides! BTW thanks a million for this video, I have a recently acquired Sharp AM/FM transistor that had a leak that was so bad even the antenna for the FM is frozen all the copper wires have corroded and the battery case is so bad that I have removed it and replaced it with one 4.2 V Lithum battery that seems to replace the 6 volt system that used to power it. The FM is pretty dead on it so this will help with my troubleshooting on that problem even though we only get one AM and one FM station in our little corner of God's Country here in South Dakota.

  • @edwardallan197
    @edwardallan197 Рік тому +1

    Looks assembled with care. Careful use of insulative sleeves. And not even completely dead. I believe Radio Shack sold a version of this board. I bought it in the 70s.

  • @charger959
    @charger959 2 роки тому +10

    "capacitors exceed value of radio when new" That really cracked me up!

  • @davidhollfelder9940
    @davidhollfelder9940 2 роки тому +2

    The chrome/nickel pin holed speaker grills were really cool 😎

  • @Pablo-he7gm
    @Pablo-he7gm 2 роки тому +13

    My weekend's happiness is directly proportional to the lenght of your videos.
    Always waiting for them to arrive on Sats and Suns to relax in the couch with a cup of tea and just forget about the past and the future (your videos make me achieve what meditation just cant't).
    Gratitude and admiration! You are generating much more than you think out there.
    Thanks! Good Karma for you :)

  • @thunderkunt5416
    @thunderkunt5416 2 роки тому +2

    Whenever the radio was squealing, a bunch of mosquitos started to gather around me & started biting me from head to toe. If I get malaria, that’s on you Shango !

  • @shaywave
    @shaywave 2 роки тому +30

    Shango, thank you for taking this repair to completion. I admire your skill and patience to root out this sort of problem. Who would have thought that such a cheap radio would yield such a great learning experience.
    Party on, my friend.
    -Chaos

    • @galibnjm5843
      @galibnjm5843 2 роки тому +7

      and I would like to thank you for your comment that you have said just what I would like to say.. this man skillful and amazing professional man he deserves all our respect and appreciation.

  • @phillanassa759
    @phillanassa759 2 роки тому +2

    Pronounced Bull-O-Va . They made nice watches at one time. That was 60 years ago when my Grandfather had one among his watches. Argentinean parts, imported by the Nazi's from Europe... JK, probably came from the far east long ago, maybe. Love the diagnosis on this challenging Sunmark Hong Coidial way to stick it out there Shango my man! Cheers !!

  • @hestheMaster
    @hestheMaster 2 роки тому +4

    One teeny tiny 167pF crapped out capacitor can ruin your whole day. Took a big dose of frustration,skill and patience to
    get this sucker working again. Reminds me of 1950's era IF transformer SMD but with a modern IF transformer. Quite the detailed learning experience for the viewers. Many would have thrown in the towel and chucked it in the bin. You got it
    fixed and it sounds great.

  • @bobbyk6585
    @bobbyk6585 2 роки тому +1

    Sure do enjoy my time being educated/entertained by Shango.

  • @randyab9go188
    @randyab9go188 2 роки тому +12

    Cap wizard saves you time! I like mine. Even though this was a Hong Kong radio at least they did take the time to put insulating tubing on all of the resistors and cambrick tubing coming from the antenna coil. There were at least was an effort at some level of quality. Many later sets just use paint over the resistor leads.

  • @jeffreyhickman3871
    @jeffreyhickman3871 2 роки тому +2

    Hey 👋, Shango066!! Almost 😅 like 👍 a pocket TV 📺!! That sucker’s packed with GREAT 👍 capacitors. Although they need replaced, this is a fantastic Japanese radio 📻. It looks like 👍 some pride went into it. I like 👍 the aluminum speaker 🔊 grille. Give it a squirt spritzer!! Your friend, Jeff.

  • @rodsradios
    @rodsradios 2 роки тому +1

    Another triumph for Captain Shangoo - Fantabulisticrustacious!!

  • @christophernetherton9389
    @christophernetherton9389 2 роки тому +7

    I really enjoy your in depth troubleshooting. I have never seen someone go as far as to use relacementcans in the IF to prove out a belief! Keep it up!

  • @Seiskid
    @Seiskid 2 роки тому +3

    Good job. Super educational. Thanks for posting this. Loved the "I Did That !" easter egg.

  • @heliarche
    @heliarche 2 роки тому +1

    I've had one of those plastic adjuster drivers for a while now. It's stamped "General Electric". I didn't know what it was besides something to do with electronics. Now I know!

  • @sincerelyyours7538
    @sincerelyyours7538 2 роки тому +1

    Your unmatched perseverance paid off on this one! Most people would give up and strip the thing for parts if a recap didn't fix the problem. Thanks for the circuit description and alignment. Those help a lot with my understanding, too.

  • @sfred
    @sfred 2 роки тому +8

    I really enjoyed this one. As a bonus, I’ve got a Hong Kong radio with a similar circuit, and you explained how the FM and AM circuits work in it too. I’ve got the schematic, but since I’m new to this I found it confusing.

  • @jimnewman5596
    @jimnewman5596 2 роки тому +1

    I like the miniature dim bulb 💡 for current limitation protection.

  • @batman4e
    @batman4e Рік тому +1

    I would never guessed it is the yellow IF can (more precisely the tubular capacitor). I have seen those IF cans on ebay, the shipping cost prevented me to buy any of them.

  • @alejandrodelta8928
    @alejandrodelta8928 2 роки тому +4

    43:34 Wow, i'can't belive you find those parts in my country, good to know. And yes, those yellow things are crystals for 455 MHz IF for more modern "chinko-dwinkler" radios and all kind of TV remote controls :p

  • @orionwarren4244
    @orionwarren4244 2 роки тому +1

    The subtle cues as to the 'cut of your jib' 10:25 are a constant source of humor, Shango. And relief!

  • @Ronl53
    @Ronl53 2 роки тому +3

    Your jibber jabber still made more sense that the one standing at the podium with the seal. I really enjoy the videos. I learn while being entertained. You make it fun.

  • @krz8888888
    @krz8888888 2 роки тому +8

    10 transistors, 4 diodes and 50 bodges

  • @aboumohamed4467
    @aboumohamed4467 2 роки тому +1

    Wow wow excellent resurrection. I never had/ thought those encapsulated capacitor could go wrong.

  • @MrDoneboy
    @MrDoneboy 2 роки тому +6

    I really admire your tenacity to repair this radio, Shango!

  • @mogensv.2769
    @mogensv.2769 2 роки тому +1

    Shango066 - You are a radio and tv Sherlock Holmes 👍 I really like your humor.

  • @dontknowbrian
    @dontknowbrian 2 роки тому +3

    It’s amazing the amount of different am/fm turds out there! Those little radios stank with brand new parts when they were made in the 1970’s!
    Shan go, you are the man! Love your patience and show! Thanks for all your hard work and great humor throughout:)

  • @alphabeets
    @alphabeets 2 роки тому +1

    I love it when a new Shango video hits my feed. The first thing I do is click the Like button. Then I look at the length. I saw this was over an hour so I knew Shango was going to be challenged. Shango’s OCD really kicked in on this one. Great great video! 🎉❤

  • @cvbabc
    @cvbabc 2 роки тому +2

    Wow, I sat through the whole thing and I barely know anything about electronics.... You just make it interesting somehow Shang! 🙂

  • @glasstronic
    @glasstronic 2 роки тому +1

    Stunning work, BOSS!

  • @radio-ged4626
    @radio-ged4626 2 роки тому +1

    One of the best fault finding videos I've seen on transistor radios with weird oscillator faults. Definitely worth bookmarking.

  • @catalinbadalan4463
    @catalinbadalan4463 2 роки тому +1

    The repair went so well the sound even turned into stereo right at the end... :)

  • @worroSfOretsevraH
    @worroSfOretsevraH 2 роки тому +3

    One of the best radio repair videos you've made.

  • @michaelclutton8446
    @michaelclutton8446 2 роки тому +2

    I enjoy all your videos, but this was one of the best. Your a smart guy finding that fault, it doesn’t matter that it’s only a cheap radio. I learned from it Regards Mike 🇬🇧

  • @luigirofartsylvain266
    @luigirofartsylvain266 2 роки тому +1

    shango066, The only radio repairman who manages to make the broadcast band sound like the dentist's drill 😅

  • @greengrayradio1394
    @greengrayradio1394 2 роки тому +1

    Maybe the oscillator frequency jumps into the signal (reception) frequency, if bad rotor contact for example, Sounds like that. You don't give up easily, you'll fix this one also. Big fan of your page for many years!

  • @MovingPicturesAVideoMetropolis
    @MovingPicturesAVideoMetropolis 2 роки тому +1

    I have no idea what you're doing but thank you for the pleasure of letting us watch your talent at work. Just fun stuff. 😊

  • @rfburns5601
    @rfburns5601 2 роки тому +1

    Thanks for going the extra mile on this one. I feel like you just fixed my Philco T500-124.

  • @bigmotter001
    @bigmotter001 2 роки тому +1

    Just another Shango006 spectacular and educational learning experience. The phone video was actually pretty D@mn good. Close ups were exceptional! Thanks for all you do for your subs and take care!

  • @TrevorsBench
    @TrevorsBench 2 роки тому +20

    Shango, ever thought of just getting some chip capacitors? They are small enough to tack in across the dead cap,

    • @johnnytacokleinschmidt515
      @johnnytacokleinschmidt515 2 роки тому +3

      I'm thinking he just did that a couple videos ago... The Russian radio?

    • @hopper7755
      @hopper7755 2 роки тому +5

      Its never a good idea to parallel good part with a bad one(bad cap can fail dead short)

  • @niteqllc
    @niteqllc 8 місяців тому

    Pretty & tiny nostalgic radio. I like it very much! It is still alive and well preserved!

  • @fretlessfender
    @fretlessfender 2 роки тому +1

    Well done finding that little cap!

  • @robtitheridge9708
    @robtitheridge9708 2 роки тому +1

    an excelnt repair. though i am at a loss to understand why a fault in the first IF would cause the osc to stop working. glad you were able to fix it

  • @digitalwoodshop
    @digitalwoodshop 2 роки тому +1

    I once troubleshoot a no audio radio with Freeze spray. Found it worked when I hit one of the black open caps when cold. I squeezed it with pliers and started to work. I was a rookie and left it and it worked...

  • @stirlingschmidt6325
    @stirlingschmidt6325 2 роки тому +2

    Great stuff! I pretty much live for these videos - lather, rinse, repeat until Saturday and/or Sunday when the next installment airs.

  • @fanofoldfans9238
    @fanofoldfans9238 2 роки тому +1

    That radio probably is way more sensitive and selective than it ever was since it's meager beginning. Maybe it's utilizing all 10 transistors now! Another repair challenge well done!

  • @55benchguy
    @55benchguy 2 роки тому +1

    Excellent Video. Love the new stickers on the Cap wizard. LOL

  • @LakeNipissing
    @LakeNipissing 2 роки тому +4

    9:50 . . . *"I DID THAT!"*

  • @phs125
    @phs125 2 роки тому +1

    Man, if I saw those traces, I would give up within a second.
    Is that really how things worked back then??

  • @stevexray6253
    @stevexray6253 2 роки тому +1

    I love those sweet radio sounds in my headphones 🎧😍

  • @BrumAdam
    @BrumAdam 2 роки тому +2

    Really enjoy watching your diagnostic skills and I am learning from them too. Thank you!

  • @dbrown51967
    @dbrown51967 2 роки тому +1

    made the mistake of not paying attention to capacitor polarity on a 1970s japanese multiband radio myself, the thing was drawing over 1 amp DOH! changed the caps round and it worked, i'm amazed there was no other damage luckily.

  • @dh-_1011
    @dh-_1011 2 роки тому +1

    Circuit Bending with Shango066! Those are wonderful sounds! Super hi-fi squeals! Love it

  • @Rev22-21
    @Rev22-21 2 роки тому +3

    Fond of those "I did that" stickers. They're everywhere here....especially on the gas pumps.
    Excellent find on that I F cap. Makes sense....something in the I F that prevents oscillation has to be something in the I F circuitry. But it takes a master to arrive and find it. Again....EXCELLENT FIND. Always enjoy.

  • @CopeCory
    @CopeCory 2 роки тому +1

    Outstanding video. As always Shango, I have learned so much. Thank you for another great ride!

  • @volvo09
    @volvo09 2 роки тому +3

    Excellent "all the way" repair!

  • @Daniel_cheems
    @Daniel_cheems 2 роки тому +1

    Nice challenging repair!
    I love the filming with the phone, the zoom is amazing.
    The sound is way better too, maybe because you are getting closer to the phone.

  • @BG101UK
    @BG101UK 2 роки тому +2

    I know you said you rarely edit but I think you just might have at 9:49 hehe 🤣

  • @tectalabyss
    @tectalabyss 2 роки тому +2

    Hi Shango0. Thank you for another cool Sunday video. Never had a radio act like that before. All my best.

  • @joeblow8593
    @joeblow8593 2 роки тому +1

    I thought it was the tuning capacitor at first. I never thought it would turn out to be silver mica disease

  • @volvo09
    @volvo09 2 роки тому +3

    8:55 "I finished my kit radio! Check out my work!"

  • @frankowalker4662
    @frankowalker4662 2 роки тому +1

    OMG, What an utter pain in the arse to work on. Great job at fixing it.

  • @pcno2832
    @pcno2832 2 роки тому +1

    8:30 That's an impressive looking speaker for a near-pocket radio; maybe it will sound lost bearable once everything is in spec. I wasn't expecting the bird's nest on the solder side of that board since the top looked fairly neat.

  • @martinda7446
    @martinda7446 2 роки тому +1

    I think its a very attractive design. I LIKE IT!

  • @K1ZEK
    @K1ZEK 2 роки тому +1

    Great video and a nice dig. I had to show that to the XYL. I saw one on a pump here in CT. 73 Leo

  • @aworminmybook8234
    @aworminmybook8234 2 роки тому +1

    i don't even understand what you do. i just like you're attitude.

  • @mikefinn2101
    @mikefinn2101 2 роки тому +1

    what a challenge and wow I learned so much I cant thank you enough for your time. This was very enjoyable to watch It will help me on my repairs. There is hope that it can be fixed. Your my favorite to watch. Enjoyed it more than you know.

  • @pcno2832
    @pcno2832 2 роки тому +1

    38:57 That's a cute little thing; it almost resembles a chipmunk.

  • @joellandry8407
    @joellandry8407 2 роки тому

    Never say die! and thank you.

  • @brianmoore5498
    @brianmoore5498 2 роки тому +1

    that was interesting. thanks!

  • @aerotro
    @aerotro 2 роки тому +1

    Sometimes components can go bad with unwanted rectification diode like behaviour introduced into the circuit throwing dc bias causing this very problem, diodes were invented by accident when whiskers of certain tin would create rectification it is a junction problem, could be caused by a bad cap or even a some types of resistor, or dry jointed solder joint. That carbon on one end means material is being deposited on the black end, like happens with battery plates ionisation from rectification.

  • @tonymoon7313
    @tonymoon7313 2 роки тому +2

    Great video as always .Would never have known you were using your phone. Looks fantastic.

  • @2packs4sure
    @2packs4sure 2 роки тому +2

    Yes sir your Sunmark transistor radio is repaired and ready to go,,,,,,,, that'll be $1170.00 ....

  • @moisesalexandrewielckensci3237
    @moisesalexandrewielckensci3237 2 роки тому +1

    Excellent, these capacitors are mostly damaged.

  • @billmyke746
    @billmyke746 2 роки тому +3

    Hitachi sold some of their gear under the Sun Mark brand.

  • @Santaji55
    @Santaji55 2 роки тому +1

    Excellent video as always. I have a query though..why does the IFT's cap being bad cause the oscillator frequency to not change? Since the IFTs job is to just select the IF and pass it onto the next stage. Isn't the oscillator tuned circuit seprate, so I would have expected that the oscillator frequency would be changing correctly but the IFT would have not been passing it on.

  • @dynotec1
    @dynotec1 2 роки тому +1

    Is there anyway to diagnose these internal transformer capacitors without removing the transformer? I purchased a Grid Dip meter a while back thinking it would be a valuable asset for working on transistor radios until I realized the the transformers are shielded😬. It does help out with the antenna circuit though. I always learn so much from these videos. Thanks Shango!

  • @normanwalz8636
    @normanwalz8636 2 роки тому

    The phone video looks fine to me. If it makes pausing/ light video editing easier for you, I think you should continue using it. Thanks for doing these videos for us.

  • @Mrshoujo
    @Mrshoujo 2 роки тому +3

    A picture-taking, video-recording camera without a pause feature is criminal. Pause is a basic feature it must have!

  • @wdavem
    @wdavem 2 роки тому +1

    That was a good one. Not that your others aren't.

  • @klafong1
    @klafong1 2 роки тому +1

    A Xicon datasheet for these types of IF transformers state that the internal capacitor is 180 pF. It seems to me that it should be OK to use 180 pF and adjust the core.

  • @ToneHobart
    @ToneHobart 2 роки тому +10

    I did that... LOL nice! I love it!

  • @sebastianpisano4813
    @sebastianpisano4813 2 роки тому +1

    Bravo.....ti seguo sempre

  • @craignehring
    @craignehring 2 роки тому +1

    Great video, amazing repair

  • @acoustic61
    @acoustic61 2 роки тому +2

    Wow! Even have FM today!

  • @Григорий-б5ж
    @Григорий-б5ж 2 роки тому +2

    as always very interesting

  • @38911bytefree
    @38911bytefree 2 роки тому +1

    That was a nice one !!!

  • @wagnerfratelli3500
    @wagnerfratelli3500 2 роки тому +2

    Muito bom!!! o seu desempenho técnico .....

  • @richardweinberger2756
    @richardweinberger2756 2 роки тому +1

    I have a small Sangean radio that I listen to a few times a week. It's so old that I bought it at Fry's in Manhattan Beach, where I spent many thousands of dollars upgrading my PC's for twenty years.
    I can't help wondering how long my capacitors will keep working.

  • @tarstarkusz
    @tarstarkusz 2 роки тому +2

    Great job on the diagnosis and repair. It might seem like a waste, but there are people who have a lot of sentimental attachment to their old transistor radios and would have problem putting 10 hours and $20 in parts into one.

  • @josericardogs1435
    @josericardogs1435 2 роки тому +3

    Also the microphone quality is much better on the phone, is it the S7 Active?
    Edit: Ohh I see the S21 Ultra in the reflection. That is why it sounds so good.

  • @JerryEricsson
    @JerryEricsson 2 роки тому +1

    Greetings, I have been a fan of your videos for more years then I would like to admit. I even took your advice and ordered a NEVSKI-402 Vintage Soviet Transistor Radio . It was sold as is, and I fixed it, just needed one capacitor and she was back up and running. I LOVE the little set, and it rests beside my bed for those nights when sleep won't come and I turn to DXing like I did in the 60's and this little guy really performs both SW and AM. My problem is, the battery cover is missing the screw retainer, I was wondering if you happen to have one in your Russian Radio spare parts that I could purchase from you? Thanks. Looking forward to your next video!

    • @JerryEricsson
      @JerryEricsson 11 місяців тому

      I decided to do a quick Dakota fix, drilled a tiny hole in the battery cover and case, inserted a tiny screw now the battery stays where it should and the cover stays where it should, over all made a whole radio from the parts. I did have to replace a second capacitor on the set a few months down the road, works great once more.

  • @4nk8r
    @4nk8r 9 місяців тому

    I enjoyed this video . Seems those I.f cans are a problem now due to there age . I learn alot from watching your videos. I'll use alot.of your tips in my own repairs . Looking forward to the next video

  • @chuckmaddison2924
    @chuckmaddison2924 15 днів тому

    You would love my Mitsubishi car radio. It does work, but it depends on the weather. Too cold display locks and controls don't work.
    Too hot the same. But a little warmth and perfect. Cold day drive 8 kilometres and starts to come good.

  • @sabbath7081
    @sabbath7081 2 роки тому +1

    Standing in front of a podium with a seal on it.

  • @bigalsmallengines
    @bigalsmallengines 2 роки тому +2

    Shango Rules!!! 🍻

    • @bigalsmallengines
      @bigalsmallengines 2 роки тому +1

      @@TheMikeMan777 I am buddy, I think I've seen just about every video.
      Some of them I've watched a few times, but I figure a guy still likes to
      hear it.... LOL Cheers! 🍻