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Ping Mike Samra - re film PSU caps for LEAK amps

Posted by Timbo in Oz (A) on August 19, 2016 at 00:06:12

You wrote recently, either here or in an email that you would like to be able to rebuild my two Stereo 20s with FILM caps for the PSU.

I'm quite happy with the bass now with 4 big 470Uf caps. But am aware that setup is 'stressing' the OEM PT.

Four caps?

And I'd be guessing a choke, or chokes?

The caps would need to be no larger in size than the 470 uf 400V Nichicons we used. The amps aren't here, so I can't measure the Nichicon's dimensions.

And, which choke (ESR, current and L) OR chokes, as IN CLCLCC or LCLCCC - plus bleed / discharge Rs?

So, TIA for cap and choke specs / suggestions.

Once I have those we can cost the bits in Australia plus the work.

While I may not be able to pay for the bits and the work straight away, you do keep on about how good and fast the bass is - with a film cap PSU - even though I can see that the energy storage would be a bit lower.

So I'd like to give it a try, can't hurt. As I do like how a mixture of film caps sound in audio stages. :-).

One more thing? I believe there's CL thermistor in the primary to the PTs - in both amps. Is there value in having another one on the 'HT' or 'B plus' secondary, so as to give heating a bit more time?

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

Edits: 08/19/16 08/19/16 08/19/16

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