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Disc ceramic vintage caps
Hello,
In 1960's japanese radio manufacturers (Pioneer, Lafayette and others) started using disc ceramic caps in their radios and tuners-amplifiers. (AM "stereo" dual radio receiver with a stereo amp 2x6BM8 is a trypical example). These caps were placed in abundance for decoupling in the RF stages. I have many of such caps in my junk box. These disc ceramic caps can be green (manufacturer TAIYO) or mustard colour (TDK). Diameter varies from 8mm to 18...20mm depending on value and dielectric. For example, one of them is marked : ..01uFM TAIYO Another (smaller): ..01uFP TAIYO Another: ..01MF M TDKE I think the letter after the value ("F" or "P") is tolerance. I guess M = +/-20%, and P could be +100% / -25% or something like that, suggesting that some are like modern X7R dielectric, others like Z5U dielectric. But my question -- what is the vorking voltage of such caps? 250V? 500V? Maybe the letter is not tolerance, but voltage? Can they be used for recapping vintage radios where upon power-up when 5Y3 warms up, the B+ voltagee reaches almost 400V? Regards, Alex |
#2
Posted to rec.audio.tubes
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Disc ceramic vintage caps
"Alex Pogossov" wrote in message ... Hello, In 1960's japanese radio manufacturers (Pioneer, Lafayette and others) started using disc ceramic caps in their radios and tuners-amplifiers. (AM "stereo" dual radio receiver with a stereo amp 2x6BM8 is a trypical example). These caps were placed in abundance for decoupling in the RF stages. I have many of such caps in my junk box. These disc ceramic caps can be green (manufacturer TAIYO) or mustard colour (TDK). Diameter varies from 8mm to 18...20mm depending on value and dielectric. For example, one of them is marked : .01uFM TAIYO Another (smaller): .01uFP TAIYO Another: .01MF M TDKE I think the letter after the value ("F" or "P") is tolerance. I guess M = +/-20%, and P could be +100% / -25% or something like that, suggesting that some are like modern X7R dielectric, others like Z5U dielectric. But my question -- what is the vorking voltage of such caps? 250V? 500V? Maybe the letter is not tolerance, but voltage? Can they be used for recapping vintage radios where upon power-up when 5Y3 warms up, the B+ voltagee reaches almost 400V? Although I doubt you'll find the info you're looking for, Capsite 2009 has tons of information about capacitors. See: http://my.execpc.com/~endlr/index.html - Chapter "Markings" and the links therein. - Chapter "More information", links page. Regards, Gio Regards, Alex |
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