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RE: Passive VS active PSU for preamps

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In Reply to: RE: Passive VS active PSU for preamps posted by limono on November 25, 2007 at 19:52:13

Hello L. This is just my opinion, and based on my experience and preferences. A series pass PS regulation, as in Audio Note's Galahad, or shunt regulated PS is pretty good. HOWEVER, one could do "better" with : hefty mains transformer, efficient rectification, and a choke input filtering. If your mains transformer has high DCR, with economy-size iron, voltage will sag the minute the final stage starts pumping in the bass. Elsewhere in AA, somebody opined that active regulation is "too little, too late" If space permits, I'd go for separate mains transformers - one for B+ (and if in an integrated, B+ pre/driver, and another piece of iron for B+ final), another for filament. And then choke input. =)

Follow Ups:

RE: Passive VS active PSU for preamps - RhythMick 15:32:43 12/04/07 (0)
My factory M3 had seperate power supplies for each channel. We found it all too much and preferred it when we split it down to a single channel, with a separate filament transformer and circuit. The remaining channel uses 2 chokes and Blck Gate WKz in pi-filter, ie

Choke ==> 47uF ==> Choke ==> 100uF
RE: Passive VS active PSU for preamps - richardcooper2k 02:24:09 12/04/07 (0)
i have heard about people not liking the sound of regulators but at the same time recognising that they can inmprove the sound. they got round this by adding some r and c after the reg to filter out the reg 'noise'

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