71.51.216.113
In Reply to: RE: No, Not Really !! posted by Donald North on October 08, 2009 at 17:04:15
Hi Donald,
I totally believe you about C Cores, and I have NOT had build experience with them, hard to source in the USA.
You state:
"The question of 2 or 3 stages is dependent upon if there is an active preamp upstream or not. In my experience, you need 3 gain stages, be they all in the amplifier or 1 in the preamp and 2 in the power amp."
If you go to the Serious Stereo web pages, you will see a two stage DC 2A3 amp and audio system that requires NO active preamplifier stages in front of it, but rather, a passive attenuator.
I have had lots of listening experience to this system, at four RMAF shows, and I can tell you the gain works out fine and it is NOT dependent upon an active preamp upstream at all.
Hence, my comments on loss of transparency with a three stage amp. With a three stage, you can pick out a delicious sounding input stage, and or a beefy low Z driver stage, but they will not together quite do what a well designed two stage will do, transparency-wise. This is my experience.
Jeff Medwin
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