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- - Opened up this Philco, and what the.....?? (http://www.videokarma.org/showthread.php?t=263942)

Electronic M

04-03-2015 01:39 PM

Quote:

Originally Posted by dieseljeep (Post 3130436)

A few years back, I was in an old radio TV shop. There was an earlier 30's Philco radio in for repair. I asked the owner if the bakelite block capacitors were replaced. He said no, they never go bad. I replied that, there would a lot of collectors that would disagree with you.
I read that those caps were vacuum impregnated. Having some experience with that process, I would almost have to agree. :scratch2:

~80 years time is enough for almost anything to go bad.
I have a 1932 Philco cathedral (the model escapes me), that essentially worked as found. It had no hum, but the audio/reception was weak and VERY distorted. Restuffing the block caps returned it to working like new.

dieseljeep

04-03-2015 05:14 PM

Quote:

Originally Posted by Electronic M (Post 3130453)

The term I used was ALMOST. The paper dielectric would deteriorate due to the chemicals used in the process of paper making. VPI, probably extended their lives by 20 years.
The last Philco, I restored, I restuffed the bakelite caps. It turned out real great. I used a heat gun to heat them. I looks like tar, but it is a high temp potting. It came out as a chunk, instead of being a liquid form.

Electronic M

04-03-2015 06:08 PM

I usually just stab a screwdriver into the tar and twist/scrape (and pry at the caps/resistors when I reach them). The tar is so soft and brittle I can make quick albeit messy work of them that way.

rca2000

04-03-2015 06:17 PM

Quote:

Originally Posted by Electronic M (Post 3130453)

~80 years time is enough for almost anything to go bad.

Except for TUBES. Since they are TOTALLY isolated from the world....they don't really "age"......thank goodness.

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