12AX7 Driver in Fender 25R

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[Freddie]

Wanting to hybreed My 25R Wondering where in the circuit to put the tube driver ? I am thinking of removing R55 before the final amp and putting the driver there.

[J M Fahey]

Basically you have to build a tube amplifier stage, send your preamp signal there, and take its output (suitably padded) into a "Master" volume pot.
That way you overdrive the tube and re-amplify its output with your original power amp.
The other way would be to copy the Marshall preamp used in Valvestates, where they drive the tone stack with a tube.
I find it somewhat buzzy but it's a very popular solution.
In any case, you will have to add a new power supply to power the tube.

[kldguitar]

i don't think it is simple things, pt need change, thebetter voltage of 12ax7 is180v