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In Reply to: RE: Those Cute, Sometimes Chrome Phono Preamps... posted by Palustris on June 22, 2015 at 13:06:41
GE developed a 6SC7 based setup that Fisher "borrowed". I've uploaded Fisher's version.
A link to a post showing the schematic for Lafayette's 12AX7 based knockoff of GE's concept is provided below.
Eli D.
Follow Ups:
So if i wanted to change the eq on this Fisher preamp schematic, what would I'd want to change out and with what values to make it RIAA?
Peace,
Jake
Boy, you'd need some really short, low capacitance interconnects between that and your preamp. I wouldn't be surprised if the commercial offerings had the output cable built into the preamp, and the length kept very short!
-PB
IIRC, some of the little "jobbers" do have captive O/P cabling.
Switching to full wave bridge rectified B+ should allow a few extra mA. of B+ to be squeezed out of the power trafo. Those extra mA. could go to energizing a ZVN0545A source follower, as was used in the tweaked RCA setup. Bye, bye, load driving problems. :> )
Eli D.
Where can I find the as source follower mod to the RCA phono? The recommended 220000 input impedance for the next stage is a bit too high for my set up.
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