This one is using 6A3's, makes a future mod to 300B's easy, just add two resistors to drop the filament voltage.
I used Edcor XPWR005 Power/GXSE15-8-3.5K outputs, Hammond 156R choke.
I used an Alps 100K volume control on a handy little Euro-connector board. Makes it very easy.
Hundreds of other amps at http://tmamps.com
... tom