a .01mfd cap on the 12AX7's pin 1 would give you way to hot an AC signal.. Taking it from the secondary of the OT gives you a signal that has already been "transformed" to low voltage high current ac signal.
This is a very basic solution. The pot = volume / amplitude, the 47K can be adjusted to give more or less signal. For a champ 27k or so might be a better fit. you can add a tone pot easily as well.
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