Maverickmonk
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are 4 tubes necessary? couldn't a dual mono 2-tube be made by splitting the ground planes? or isn't dual-mono the same as balanced?
So:
1) The 12AU7 tubes can handle 2 channel per tube
2) The amp from the link you gave me only uses one of those channel so two tubes (plus the reciprocal of the circuit) would be needed in order to output stereo
3) The SSHM must be the same because it uses 2 tubes.
Thanks for the help you are supplying.
I found this on a quick google images search for "12au7 starving student schematic"
The main one you can do without is C7/C8, since that doesn't necessarily improve SQ very much. You can try searching for info but I don't think there's very much about it besides the fact that they increase gain (by reducing feedback, I think).