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RE: non-inverting preamp w/schematic ver. 2




TK,

I made some adjustments to the schematic that resulted in more gain, lower THD% but slightly higher Zout.

Without the SubOut and 4.7K isolation resistors, Zout @ 20Hz = 5.8K & Zout at 1KHz = 4.9K.

I needed 23dB of Gain to drive my SE 6CB5 triode amp into clipping, so this circuit works OK for that.

Didn't have room on my preamp chassis to add a follower, but with short cable runs in my system, it does not sound like I needed it.

I set my volume pots at 8-9 o'clock for average listening.

Subjectively, I find no issues with sound quality so far.

Thanks to all for comments and ideas.

dt 667






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