never said any such thing of course - less sensitive is not totally immune - and PS with just rectification and filtering without regulation for the output stage is common in audio amps - even SE - but push-pull balanced output drive is a lot more immune to PS Ripple, Sag, non zero impedance...
push-pull balanced output drive is the standard for direct drive ES amps - easy to name a 1/2 dozen balanced push-pull ES headphone amp designs, to one that isn't
I was mostly objecting to the seeming categorical dismissal of electrolytic caps - they work well enough that you find them in most $k ES headphone amp power supplies - even at these levels few want to spend for brick sized film caps needed to give similar technical performance
sometimes diminishing returns are really not worth pursuing - there really are audible thresholds below which differences can't be heard
as a conceptual art project 100s of uF of kV rated film caps could be justified for the "infinite" life - but using films as PS reservoir caps fails coming close to audibility thresholds from the engineering numbers for electrical circuit performance effects vs electrolytic caps, particularly with regulation, added immunity of balanced push-pull output
@100db100V sensitivity you need 1 V across full size Stax headphones to even be at the human hearing threshold after minutes of adaptation in an anechoic chamber - compare to:
KG on the KGSSHV PS:
Tests indicate about 12 microvolts of noise at full power. Its when the diodes turn on, and
using the 35ns soft recovery diodes, even ceramic caps across them make no difference.
Over the range 10C to 50C and under full load the power supply voltage changes only 1.2 volts.
Measuring this is not at all easy. So i'll call it a better than -140db power supply and be done with.
derated modern electrolytics ran cool will last decades and occupy a fraction of the volume and price - the volume and price advantage giving plenty of scope for adding circuitry to improve actual performance - which may well involve smaller film caps where they do make a difference
Edited by jcx - 5/23/14 at 2:22pm