SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: SET Power supply in series with output trans

Posted by cpotl on October 29, 2016 at 17:17:33:
"Ok so looking more into lclc power supply for my little gm70 amp I realized that the last cap could be in series with the output transformer meaning its in series with the music??

If this is so, IYO what would be better For the last C? more capacitance or less? I am thinking most people would say LESS but... but will this affect Low Freq response?? hmmm yeah"

Yes, the last capacitor in the power supply is in the audio signal path. Cold logic would say that the ideal power supply is one that presents essentially zero impedance at all relevant frequencies. This ideal would, other things being equal, be approached by using a large value for the final power supply capacitor. (Maybe bypassed by smaller ones, if there were reason to think that the impedance of the large capacitor had some sort of frequency-dependent anomalies at higher frequencies.) In any case, any shortcomings that represented a deviation from the ideal would be demonstrable by looking at any residual audio signal appearing across the final power supply capacitor(s).

However, there is absolutely no reason to think that the sound quality that the listener will find most desirable is the one achieved by the "ideal" power supply. For example, if the listener prefers a bit of bass cut, then a lower value might lead to a more satisfying sound.

Personally, my view would be that if one wants to experiment with boosts or cuts in certain ranges of the audio spectrum, it would be better to do this by means of carefully designed tone controls or equalisers. It is a bit of a hit and miss approach, if one does it by swapping power supply capacitors. But I understand that my viewpoint is considered to be too clinical and engineering-based by some audiophiles.

Chris