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In Reply to: RE: Lower gain (than 5751) direct replacement for 12AX7 tubes ? posted by Old SteveA on June 19, 2015 at 11:16:52
When I want real low gain on my phono preamp I use a 12au7.
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Which position?
Doesn't that mess up the RIAA eq?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Not with my preamp.I've been doing it for years with no problem.I can use a 12AX7,5751,12AT7,12AV7 and 12AU7. It is a Quicksilver phono preamp.
That's interesting.Have you ever taken voltage readings to ascertain the operating points with each tube choice?
Sorry, I didn't really mean to change the subject.
"The new Quicksilver Phono preamp offers high gain, low distortion, low output impedance and both active and passive RIAA eq."
Different tubes (even when operating under ideal conditions) all have different plate resistances. The plate resistance of a triode is a large part of why a stage has the output impedance that it has.
The output impedance driving a passive filter affects the results of the filter.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/19/15 06/19/15
I have the older model. I have never taken any readings. I just change the tube depending on what phono cartridge I use. Low output higher gain tube,higher output lower gain tube. This is the Quicksilver I have,it is the older model.
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