Tube DIY Asylum: Re: How to design a passive single-network RIAA (two tubes) by Kurt Strain Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by Kurt Strain on March 25, 2002 at 06:52:18

In Reply to: Re: How to design a passive single-network RIAA (two tubes) posted by Chris O on March 25, 2002 at 06:38:45:

> > I would like to use a similar circuit using 6SL7 tubes in a SRPP configuration. How would I adjust the circuit for this?

You just need to calculate Ro differently, for this case.

For the bottom tube cathode bypassed version of the SRPP:

Ro = [rp(rp+Rk)]/[2*rp + (mu+1)Rk]
where Rk is the resistor between top cathode and bottom plate, and the output is taken off the top cathode.

I have no other formula for different versions.

Kurt

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