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I'm with Tre' on this one

You really should consider optimizing the circuit for a particular 12A*7 tube. The operating points are quite different between a 12AX, 12AU, 12AT and 12AY. That can have a big effect on gain, distortion and how well the tube can drive the power tube.

If it were me I'd likely try to use the 12AT7. Its got more guts than a 12AX7 and is often used for driving power tubes. The extra gain could be used for feedback since this amp likely sounds fine without any at all; the feedback would allow the amp to drive a wider range of speakers with flatter frequency response. And a greater amount of usable power. If you mix the feedback with the incoming audio using a divider network rather than applying it to the cathode you'll find it doesn't have the ill qualities so many people say feedback has.

Is a schematic forthcoming?

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