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In Reply to: RE: Do you really want a preamp? posted by andy evans on January 26, 2015 at 16:15:45
Autoformer Volume Control or TVC usually will provide all of the gain control one needs. I really like the Twisted Pear Buffalo, with its software volume control. However, because I am crazy, I put it through a 10/801a preamp for fun.
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Yeah, but don't forget the impedance matching function of a preamp. If you are not starting with a pretty low impedance source (like a DAC) you can really be wasting a lot of money on a passive control. 10:1.
The only thing that does not have a low impedance output is a tube preamp that has a simple plate output. Might be doing better to fit a volume control on that beast and/or an output impedance transformer. The problems that a preamp can solve are mighty rare. It will be a lot better to fix the rare case of a high impedance tube phono preamp.
There are plenty of solid state output stages that have output impedances of a few thousand ohms.
"There are plenty of solid state output stages that have output impedances of a few thousand ohms."
Such stuff is (IMO) very questionable. I strongly believe in accommodating the "lowest common denominator", which is the IHF 10,000 Ω I/P impedance "standard". Therefore, line level O/P impedance must be <= 1,000 Ω.
Eli D.
But still, 2K into a 10K load driving a foot or two of decent cable dissolves into an academic discussion in the faculty lounge.
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