Capehart AM FM Receiver Repair

Any part can fail

[@teacfan1080]

Congratulations on bringing it back to life! Part of the fun of the challenge is taking something that looks hopeless and making it work again. Sounded decent too at the end of the video. Nice work!

[@LyonsArcade]

That's really cool how the lights turn on and off for FM/AM what a neat design. It's the little things folks

[@dannyasher3259]

Thank you shango,,,,,your video's have helped me alot about the FM section.

[@MsCori76]

Nice to see you saved the radio to survive another decade from the trash. Your area is like mine with all the planes flying over all the time! I cop it a lot here over my house. Happy New Year 2017.

[@alanmaier]

I'd like to see the earlier video when or if you post it. My mother bought a new Capehart in 1951, either the 1005 or 1006 model that is still at her house in dry storage and minty cosmetic condition. I have the Sam's on it and plan on restoring it when the day comes she is gone and it has to be moved. Hers has a single 6V6 output, and a simpler tuner section (as per the schematic) and I know the radio was basically dead back in the 1970's when I used it as a record player as a step up from my horrid Wards Signature fold down stereo and buying components. As a kid I know it sounded pretty good with it's single 12" speaker as my mother would stack up 78's on the 3 speed VM changer. She actually wore out the platter gear on that changer! But I have a replacement changer pulled from a true Crosley of the same age.

[@shango066]

the video is called console tvs and pet beds or something like that. It should be below this one

[@tough213]

I am glad to see you have been reinstated to you tube and I hope that you never get bumped again . you are a great asset to youb tube and wish you a very happy and healthy new year and all the best

[@thisisall50charactersbeing47]

homosexual

[@DAVIDGREGORYKERR]

Scrappers need to learn that you don't scrap antique radios.

[@MsCori76]

DAVID GREGORY KERR true.

[@waltschannel7465]

Nicely done. Not sure what was more fun, watching you diagnose the trouble or finding an approximate Photofact. 😁

[@2509498788]

I TRULY ENJOY WATCHING YOUR CHANNEL..YOU SURE KNOW YOUR STUFF , THANKS

[@hughgotmail5275]

Great video and explanation of everything that you have done. I have a Capehart 1009 installed in a cabinet. At this point, I can't figure out how to remove it. I've taken out 3 machine screws which come up from the bottom shelf, and have removed the 4 knobs and the noise control switch. My guess is that there are screws hidden behind the bezel, but if this is the case, I'm not sure how to remove the bezel without breaking it. If this isn't the case, then I'm still stumped. Thanks.

[@justsumguy2u]

I've never seen one of those trimmers go bad, either......very strange. But I'm glad you got it going again, that's a nice quality unit.

[@stuszith]

Glad you recues it from the Scrappers --btw what year is this Monster!!??

[@Antony_Jenner]

The chassis looks like my Halicrafters S20r lol. I bet there is not many in Australia. I love this stuff got a couple Australian made 1930s console radios going last year, It's good fun would love to get a FM Valve Radio to have a play. Your Vids are awesome Shango...........

[@AntiqueRadioandTV]

Nice job figuring out the oscillator trimmer cap wasn't functioning 100% Have fun with the radio now while painting. It will be short-lived though because you "won't" have fun scraping off the paint blots off the cabinet later. Happy New Year!

[@arthureverett8220]

Capehart was the Rolls Royce of electronic back kin the mid thirties and forties

[@jwl9286]

Great job! Love the way the dial light switches. Isn't it great to be right? You figured those capacitors weren't bad. I appreciate the way you seem stumped even though you come through. Again Great Video and happy new year.

[@TheGuitologist]

That oscillator trimmer is probably filthy. Did you spray it out? I bet there's a layer of gunk inside preventing contact.

[@TheGuitologist]

oic....its a variable cap. Hmmm. Still, wonder why that would go bad...

[@shango066]

There is no contact in a trimmer capacitor like a resistor, its got a mica wafer in it and plates squeeze down to increase capacitance. Spraying it would destroy it. And this is a super low value, 4-10pf just a few mm or lead length has a huge effect

[@shango066]

The mica could have turned to dust of something. Its such a low value cap the guts are super small

[@TheGuitologist]

At least it's a cheap part.

[@MrHBSoftware]

it happened the same to me in a telefunken...fm and sw worked fine but mw and lw gave lod crackling just like SMD...but as there almost never any case of SMD in european radios the culprit was a trimmer cap exacly like that one...in my case rotating it back and forth solved the issue

[@DavidRLocke]

That FM demodulator circuit I would think is a ratio detector, rather than a Foster Seeley discriminator, which needs more IF stages with a limiter at the end driving that transformer. If you have the ratio detector you can use the same procedure to align it to center, but the performance from it will never be what the FS discrim can be for fidelity. Poor high frequency response, along with some distortion that you'll never really get rid of. I chose a ratio detector for the first few FM sets I built, but quickly went to the discriminator, and added the necessary IF stage(s). My last vacuum tube set and my only solid state unit used a balanced bridge discriminator, which is the best of both types.

[@DoRC]

Best place watching channel ever!

[@DavidRLocke]

As for the failed oscillator it can be tricky to get them working when the won't fire. Your technique for diagnosis is pretty much the same as I would've done. Sometimes just a touch of the screwdriver to the tank coil would get it going, and it would remain working until the set gets shut off. On powerup later on the same thing would have to be done. Like in your case it is usually a bad capacitor, and a type that you would think would never go bad. Also don't forget to check for any temp coefficient rating that might apply.

[@SpeakerFreak95]

Really neat how that survived the copper thieves

[@rsattahip]

Those large color coded capacitors (upper right corner)were horrible even when this equipment was relatively new. I remember changing them for leakage in the late 60's in equipment that was not very old.

[@SpeakerFreak95]

Another great informative video. Thanks for the great video!!

[@ricardosalesdemello4130]

Oh! yeah! I like yours vídeos friend shango

[@MsCori76]

It's a shame the scrappers ruined it as it would've been a lovely unit in its time.

[@ZenithClarity]

Have you ever shown your sams collection? Would be an interesting video seeing the literature you have.

[@shango066]

It would be a video looking at old filing cabinets and pdf files on a hard drive. Not real interesting stuff

[@ZenithClarity]

Ok.

[@andershammer9307]

I've seen a few of those trimmers go. Especially in a certain RCA chassis which I think was the 612.

[@tectalabyss]

Hi Shango. Anymore interesting capacitor comments. Lol. Just goes to show no part is fail proof. All my best. Bobby

[@skuula]

Hey we should put together a virtual AA cannon for you to shoot at those airplanes. A real, inert cannon with old school sights, and a ham band radar or image analysis to guesstimate whether the shells would have hit or not. It's ironical that the vehicles whose noise can bother the most people (by flying over them) are also those that are under the most lenient noise and emissions control. Same in various other countries.

[@KennethScharf]

IF SM disease? 3 gang variable cap in fm section, suggests RF amp and self oscillating mixer. (or double tuned rf front end). Actually there IS another tube in the FM section, that must be the RF amp, looks like a 7 pin, so probably a pentode, but if it is a 9 pin then probably a cascade dual triode.

[@luisantoniomarrega3713]

Receptor interessante, os valvulados são mais fortes! Rio Brasil

[@tkelly411]

shango ..a lot of activity in older hsg renovation or new housing & groundbreaking?

[@tinicum54]

Newer Solid State versions were dubbed CRAPHART by my fellow workers and I. Late 70's.

[@chrisrizzo6624]

did you get the tail number off that dive bomber ?

[@jermcrow3408]

very cool!! thank you for the video.

[@kareno8634]

Well i feel better you got it! - cause me not 'grasping' this, yet, i guess, ask [no one here], then wait for Big Picture in head so i'll find it. hmm . . . Nice Search info! You Win =]

[@douro20]

Is that a Type 80 rectifier in there?

[@bones007able]

I have a grunow 750 with a bad osc coil, the windings turned to green dust... schematic says the coil data is on page 7 of the service literature... of course is the one page of the schematic was never scanned on to the web anywhere, ....it figures......so it's been wind , retry, wind, retry etc etc...

[@markmarkofkane8167]

Shango, are the spy planes still watching you?

[@bones007able]

was that plane harrison ford looking for a golf course to land on? lol

[@DAVIDGREGORYKERR]

What about an ECC88 as the FM LO vacuum tube.

[@andygozzo72]

yes and no, you'd have to change the heater connections slightly, and reduce ht to about half, better would be ECC85/6AQ8, as its characteristics are nearer to a 12AT7/ECC81, but still needs the heater wiring changing

[@custardo]

you have a more than decent zoom on your camera

[@hannonm]

i wonder if there's a bad resistor Biasing something too hard or too low.

[@shango066]

I thought that but that trimmer cap having little to no effect seals it for me that its bad

[@andygozzo72]

definitely...., i've had 2 of those modern 'polyvaricon' tuning caps fail, they get tight and the poly sheets tear off the fixing posts...

[@kg4yhr]

is that de oxit that you were for contact cleaner if it is how do you like that stuff there is a electronics store in sarasota florida that sells it but its 8 dollars for a 4 ounce can i aquired a heathkit sb 101 with dirty switchs and contacts and need to clean them any opinion would be greatly aprichated

[@shango066]

yea gun cleaner lube and wd40 work too

[@kg4yhr]

ok thanks i have put the heathkit on the air the guy i got it from did not know how to even use the radio and its almost museum quality its that clean ok thanks

[@shango066]

i would replace the capacitors in that thing, seems heathkit used junk electorlytics because they always seem to be shorted and burn the power transformers up. good way to render it junk and have serious regret

[@kg4yhr]

i plan on going thru the whole radio including the power supply but thanks for the tip send me an email my email good on qrz so i can send ya some pics of it then one day iam going to get my heathkit sb 102 going 73 sir and happy new year

[@MsCori76]

shango066 You can't beat the old WD40. We call it Possum piss here in Australia. LOL

[@jeffscomp]

Nice old system.

[@fakundofrontera]

haha that plain, i think that was the hum of tha radio xD

[@justincase3880]

Airplane with transonic prop tips …

[@mechadrake]

cessna, please:)

[@leleo_AR]

Essa câmera rodando me deixa tonto ....

[@_Ramen-Vac_]

it's all of the radios you have.. they think you're the tower.. Bzzzzzzzzz...

[@leetucker9938]

skyrizi