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Original Message

RE: SET Power supply in series with output trans

Posted by Paul Joppa on October 29, 2016 at 18:43:42:

People have been experimenting with large and/or huge capacitors for decades, in the hopes that at some point they would have enough to function like regulators. I have not seen enough repeatability to say there is any consensus. In such experiments with regulators as I have done or heard, more capacitance is usually better but never good enough. And as noted by others, electrolytics especially have HF limitations requiring bypassing, one of the more arcane arts of audiophilia.

I speculate that frequency response is not the right criterion. My tentative candidate is envelope modulation - that is, the fluctuations in musical loudness. This is clearly dependent on the music as well as the amp time constants, which does muddy the waters. And if you are worrying about THAT, then the time constant of the interstage cap or choke or transformer should also be considered.

If you have access to simulations, it would be an advantage to look at the PSU/output stage together, allowing for the OPT inductance (and plate choke if parallel feed) to play its part. It is genuinely more complex than we think initially!