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Re: RIAA design dilemma, need your opinions.

Posted by Thorsten (M) on February 19, 2002 at 11:06:15

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

Hi,

I have been around the same bends a few times. The BEST solution is split RIAA in a three stage design, which removes the need for compromises, especially if you use high Gm, low Rp Valves. I would probably consider RLC (Tango style) as better, but have so far not heard enough using this principle to make solid call.

Another option, especially if you place the coupling capacitor BEFORE the RIAA Network (which is IMHO a particulary daft idea, but never mind) is to have the Gidleak resistor there and then to follow with the RIAA EQ, all interactivity is removed, other than that the gridleak resistor plus the RIAA EQ series resistor must be lower than the maximumpermissable grid resistance.

Or perhaps not - if you use a vary large Value Grid Resistor you can use fairly low value coupling Cap's AND dispose with the cathode RC combo, by gridleak biasing the Valve....

Ciao T

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