[robert casey]

If you want a clinically accurate circuit, solid state is the way to
go. National Semiconductor for one are making op-amps now with THD
well over 100dB below signal level.

Though I'm not enough of a mathematician to rigously express it,

my gut feeling is that op-amps with the tons of negative feedback
is not a great device for audio work. Non-linearities will create
harmonics and intermodulation products. Then you try to cancel that all
out with the feedback, but as you may cancel most of the lower order
crud, you then create even more higher order harmonics and
intermodulation products. And that loops back yet again. But there's a
time delay in getting that feedback signal to the input, which means you
can never cancel the leading edge of crud products. Thus it's better to
use small amounts of feedback on circuits that are pretty good even
without feedback. That's discrete bipolar or FET transistors and tubes.


Sir, I dont want a clinically accurate circuit. I dont want solid state and
op-amps(though I do have some very nice amps that Use ICs that were made by
Mr. Mick Hinton(DAV Electronics)..I use them a lot and am quite fond of
them....but I want what I stated when I first posted..(which Rudy has
translated for me(thanks Rudy, you said what I was trying to say in fewer
and better words,)

One thing to remember is that tube equipment will get warmer than SS.
From the heaters, mostly with a mixer I would think (it'd be mostly
12AX7s and 12AU7s and such, yes?). Lots of vent slots underneath and on
the sides and back for natural air flow. You won't want fans, as those
are noisy and you surely don't want that when doing critical audio work.
Use DC on the heaters, no point in risking induced hum in the mixer
circuits. And keep the heater supply and returns separate from the
other circuits except for a single tie point to ground it all.

and no, to re-iterate..I am not trying to pick brains so I can steal
secrets.

Oh, at least with me, don't worry about that, as I've always worked for
large corporations where one's work really has no impact on the
company's bottom line.