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-   -   How to design input stage with specific input impedance/pot value (http://www.diyaudio.com/forums/tubes-valves/155158-how-design-input-stage-specific-input-impedance-pot-value.html)

mahleriana 16th November 2009 10:37 PM

How to design input stage with specific input impedance/pot value
 
Hello there,

Because of my DIY phono stage high Zout, I would like to optimise an amp input stage around a 220k or above value pot (it doesn't work well with my existing input stage). I also tried a cathode follower at the end of the RIAA preamp but still prefer my 2x6sl7 anode follower passive preamp "RCA style". With this one, I just miss the frequency extremes.

What are the rules to design an input stage (anode follower please) around such a value, or in fact around any input impedance value ?

Thanks in advance !
eric


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