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16th November 2009, 10:37 PM
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diyAudio Member
Join Date: Nov 2007
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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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