- Posted by

In Reply to:
RIAA design dilemma, need your opinions. posted by **JLH**
on February 19, 2002 at 10:46:57:

What I've done is to first choose the source impedance for the RIAA network (plate resistance of the first triode) and the grid ground return for the second stage. Then the RIAA can split the difference, so to speak.Note that the source resistance adds to R1, while the grid return R0 is in parallel and efectively reduces R1. With the right combination, the net effect is zero, so the actual value of R1 is the same as if rp=0 and R0=infinity.

In practice, there are only a few combinations of available resistors and capacitors that work out to a pretty good RIAA without fussing. Given one of those (close to the target found above), and rp of the first stage, you can calculate an R0 for the second stage.

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Follow Ups

Re: RIAA design dilemma, need your opinions.-Paul Joppa11:40:44 02/22/02(0)