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In Reply to: RE: BAT's tend to have cap problems posted by unclestu on March 21, 2015 at 20:18:27:
Well, one needs to be careful when making general statements.
Some of those amps in their initial configuration, VK-60's, are now close to 20 years old. But they are still running and running, we hardly see them back for service.
The way the amps are designed, the internal components only see very small temperature raises. The tubes are indeed running hot, the components are not. There is no issue with the electrolytic capacitor life in them, we replace few pieces now and then, due to normal random failures.
On subject of oil capacitor, there is a lot of confusion here. Some of the older style capacitors will leak a small amount of oil after a while - which is in those amps totally harmless. Several years ago the seal on them was improved, and we have not seen leakage in those. This should not be confused with the electrical leakage in the preamp output capacitors, where this will affect the operation. There is no such sensitivity in the power amps, up to the point of a complete capacitor failure, which happens VERY infrequently. Thanks to the self-adjusting nature of the bias circuit, a significant degree of parameter shifts can be easily accommodated.
BTW, those capacitors are aluminum, not copper.
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Follow Ups
- RE: BAT's tend to have cap problems - Victor Khomenko 09:37:06 03/22/15 (2)
- RE: BAT's tend to have cap problems - Eric Chan 13:31:16 03/22/15 (1)
- RE: BAT's tend to have cap problems - Victor Khomenko 13:38:09 03/22/15 (0)
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