2. amps-preamps
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TVC Gain effects

A lot of TVCs, like my AudioZone, can produce gain, usually 6dB. The AZ does this with a switch (I think the Bent just engages gain automatically once you're above unity.)

Does anyone know what the effects, if any, on output Z and frequencey response are of engaging gain?

I tend to prefer the unit with the +6dB setting engaged, even at lower volumes.
paulfolbrecht
ngjockey
1,042 posts
 
The additional 6 dB of gain affects impedance issues for the worse. For the S&B, the input impedance would be 2500 and the output impedance increases. Obviously, that isn't a problem or you prefer the frequency extremes slightly rolled off.
paulfolbrecht OP
603 posts
 
Thanks! I did find this information on the S&B page as well.

I guess it is better to use a volume setting closer to unity gain (-8 or -12dB usually) with the 6dB switch off then to keep it on with a lower setting.

With a source Zout of around 30 and amp Zin of 100K, you might say I have "impedance differential" to spare, but still..

Some say that they prefer the trannies with the extra gain, which is probably a little strange.
sutts
700 posts
 
The Audiozone Pre-T1 TVC preamp tends to sound a bit better with the additional 6db of gain- don't ask me why...
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