Hello Tom!
On 17 Apr 98, Tom Scioscia wrote to Rich Lockyer:
 TS>        So, it's not really an active midrange boost like I thought it 
was.
 TS> But how much of a boost is it? It's just basically overdriving the first
 TS> triode enough to sweeten it, huh?
There's a noticeable volume increase, but not much.  It's really just adding 
a touch of clipping to the first stage.
 RL>> I built that little 30mw tube practice amp,
 RL>> and it could not be heard with a tone stack in place... an extra
 RL>> driver stage would have been needed to make up for the signal loss.
 TS>        It added that much resistance to the signal?
I'm not sure what it was, because with all of the controls on "10", the stack 
is basically bypassed, though there is still some resistance leading to 
ground, which would be in parallel with the rest of the amp, and is probably 
the source of the loss.
 TS> Maybe if there were
 TS> some higher gain 12AX7 plugin replacements that could drive it a bit
 TS> harder.
This one uses two EL84 output tubes driven at about 15vdc, but the preamp and 
PI are all TL084 quad op amps.
C-ya! Rich
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