IF Transformer Silver Mica Disease Repair

Figuring out capacitor values in IF transformer

[@shango066]

Give this one a thumbs up! Everyone who works on radios should see this, share it

[@hannonm]

+shango066 i can watch 4k on my hybrid LCD.

[@doomloop1977]

+shango066 thanks for the video great

[@boardernut]

+shango066 spent my idle time at work watching your videos throughout 2015, have a good 2016 hoping to see more stuff and leaning from your experience in electronics.

[@Jtechmodern]

+shango066 I have a GE Bakelite radio I recapped I believe it's a 1949 or 1950 model, seems to from what I can tell from your Videos have a real good case of silver Mica disease in the I.F Transformers. if you would be interested in repairing this radio or putting it in a video Let me know it's light enough to ship and not that big. maybe we can work something out if you want to email me my email is [e-mail]

[@leetucker9938]

@@hannonm sausages

[@LyonsArcade]

"I'm sure someone is filling their colostomy bag...." I gotta steal that one, LOL

[@LyonsArcade]

I gotta admit, I've seen you do it before, but when you put the variable caps on it and it was completely dead I thought man there's something else going on, but nope you tuned them a little bit and it came right in. That's crazy that it has to be so exact, if they're just a few pf's off it doesn't even get a signal.... thanks for the video, very informative.

[@DEW409]

These videos are very good. You show how to methodically repair this stuff with parts as close to the original values as possible. Excellent work!

[@steverodgers1112]

To make adjustment easier with trimmer caps, it sometimes helps to parallel a fixed capacitor across the trimmer. This will reduce the adjustment range and make the adjustment less touchy.

[@GrandsonofKong]

Filling their Colostomy Bag over cap lead length...I love it! LOL!

[@kenseabury1067]

The music playing in the background brought back *a lot* of happy memories! That was *cool,* the way Shango soldered those trimmer caps in instead of mica caps and adjusted them for correct values! It never occurred to me that this can be done!

[@michaelledford4751]

Same here ,i had no idea ,watching that shows me how limited my knowledge is .

[@fordmustanggtish]

I know this video was not new but it is some great having an electronic store nearby that actually sells things other than Bluetooth headphones and tablets! Thanks for the video , very good content.

[@nor4277]

I love that old meter of yours ,never seen one like it ,I love old repair equiptment,seems to work better

[@teacfan1080]

Wow, that cap checker looks like something that came straight out of a nuclear silo from the 50's!

[@wdavem]

"... filling their colostomy bag..." ROFL!!!

[@PelDaddy]

My colostomy bag overfloweth.

[@ccronn]

Ba de ya, say do you remember Ba de ya, dancing in September

[@jasonmushersee]

That corrosion looked like electrolysis from current flow. DYK that in stall barns/milking parlors we still use rotary phones because of the high humidity content.

[@hestheMaster]

Friggin' brilliant Shango!

[@JustSomeGuy1967]

I about wet my pants....."Filling their colostomy bag" still laughing!!!

[@rfburns5601]

I would guess the oil is corrosion prevention between the pins and the silver plate. Two dissimilar metals exposed to air will generally form crust due to electrolysis.

[@stevenking2980]

That's what I thought. Like when you buy Russian surplus guns or tools from the Chinese tool store (H Freight)...

[@audiovideoguy0392]

I acquired two GE Musaphonics and both have the exact same symptom. I tested the tubes..Good..changed caps, still complete noise. Took the covers off the coils and there they were. Now to order some trimmer caps. I have some "somewhere". After 45 yrs in electronics lots of things are hiding.

[@Mr_Meowingtons]

good work dude! and love your videos.

[@stevenking2980]

Excellent video. Is that a Hickok military cap tester? Man that's a nice machine to go with your Tb7a-u (I think that's it, I have the fourth gen)

[@justsumguy2u]

It's coming along nicely, great vid. I never had a capacitance checker, I always have to fart around until I find the right capacitance values---very time consuming. Maybe the wetness was caused by someone trying to free a stuck slug with contact cleaner?

[@mountainhawk9802]

nice work...thank you for this informative video

[@jrs0007]

Many years ago I found an if transformer that was like the one you have. Some bimbo had sprayed something oily in it. I cleaned out the residue and put the thing back in the radio for the hell of it and it worked fine. Back then you could get replacements but they were very $$$$$. Never got a call back, so the fix must have held up.

[@jeromeorlandella748]

I think the wetness is some sort of special oil, maybe mineral oil. A non conductive fluid to keep the contacts from oxidizing or corroding. I saw the the video with the silver mica problem and that I.F. Transformer was dry.. I would bet a light grade of mineral oil was applied the the plates of the caps before assembly. Thanks for the many hours of enjoyment.

[@RODALCO2007]

Excellent video.

[@Pwaak]

Top Shelf repair and video...Thank's!

[@TonyFleetwood]

i dont fix stuff of this caliber but it deserves a thumbs up! regardless of what my own thumbs are doing :)

[@lesjohnson9740]

Yes Shango066 required watching for any Tec working on vintage radios., thanks.

[@Tron1731]

i would spray the next one with break cleaner get the oil off and just see if its becoming conducive thanks for the good video i like the video of you robbing that philco of its good cans i have a old peavey cs800 from the 1970s needs work on the amp card interested in fixing it

[@HDXFH]

Came up well

[@docfoot316]

Like your test gear ,cap measure

[@connorm955]

Disco hits with Shango066

[@compositeguy4696]

I love your videos Shango, where did you learn so much about electronics?

[@hannonm]

+Composite guy the same way all of us learn. By doing!

[@burlatsdemontaigne6147]

Amy Marie ______ Brain surgeons and airline pilots don't learn "by doing". They are trained and spend years studying. Its an alternate method called 'education'.

[@herbertsusmann986]

What is that C meter? looks like quite a boat anchor! I use a modern one made by Almost All Digital Electronics that works really well for small value (

[@VintageElectronicsGeek]

Great work! I'm surprised out of all your toys, you don't have a resistor decade box?

[@skuula]

Maybe I'd have soldered a piece of wire on that trimmer to reach the post on the cap meter, instead of the long alligation lead...

[@helioshaul3924]

Just athought but is that palastic coil base sweating, it might have a mild vinegar smell, some old plastic start to de compose and sweat acetic acid, and in turn destroy the capacitors.

[@jamesmdeluca]

Greetings: Testing for resonance on unmolested IF x'formers (guessing): Since parallel resonant tank circuits have high-z, use an RF signal gen (with series cap to block DC) at 10.7 mhz with an appropriate series R to measure across, check for hi-z with tank in series between sig gen and gnd. Non resonant tanks will pass too much signal across the series R. What do you think? When you replaced the coil into the shield I did not see the gnd tab to confirm proper orientation, but working g is good enough for me. Those trimmers are better for 455 khz X'formers; need much smaller trimmers for FM 10.7 MHz IF x'formers.

[@HEHE-dx9og]

Some one may have cleaned the chassis with contact cleaner. Thats a silver mica killer. People have no idea what they are doing. I have seen many people spray contact cleaner on radios before and just kill them.

[@MrMac5150]

Very Good Work

[@stevenking2980]

Hello Mr. Mac. Nice new pic!

[@MrMac5150]

Steven King I like that Trump for President. winner.

[@criticalshareholder6626]

This is recapping for pro's :) Nice job, but again I wouldn't want to burn my fingers on those bad transformers.

[@craneoperator4]

I had never seen the cans with that much wobble

[@toltec13]

Why add the trimmer capacitors? I've seen other videos where the diseased mica wafer capacitor had been replaced with 100 pico farad capacitor and worked well.

[@MrRobert5]

Where did you get those variable capacitors?

[@audubon5425]

It's easier doing this with an analog meter...just food for thought...

[@rodolfogomez382]

Do you really fix the if transformers? did you add some capacitors to the fi transformers, value?

[@SuperFredAZ]

micro-puff (pf) I think you mean pico-farads (pf)

[@4nk8r]

Filling there colostomy bag roflmao only shango 😂

[@vistamasterracegaming6515]

uhh wat

[@jimw7ry]

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