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In Reply to: RE: Eli - Questions Regarding Values posted by Triode_Kingdom on July 22, 2017 at 12:34:04
The changes accommodate the grid leak biased 2nd gain block. I had help with the values, from another "inmate" who (unlike me) really knows his way around RIIA EQ networks.
IMO, the differences (if any) between 6H2П-EB (6n2p-ev) and 12AX7 are far too small to be important.
The grid leak bias idea comes from Thorsten Lösch and improves bass extension by lightly loading the RIAA EQ network.
Eli D.
Follow Ups:
Thanks, that's helpful to know. I don't see a problem with bass extension in the RCA design, so I'll probably stick with the original values and topology. I do like the improvement with the 24k resistor that you noted. It's clear too me now that I'll need to build an inverse RIAA to verify accuracy, regardless of the final design.
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