+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.
+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 G3justin@gmail.com
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.
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.
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.
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?
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.
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.
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.
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.
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
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 (
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'.
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.
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.
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.
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.
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.
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!
