Andy,
The stereomour uses AC filaments, and yes, you can build it as a power amp only by leaving out the selector switch, volume pot, and loading the input with a 100k resistor.
Hope this helps,
Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)