I'm thinking of building a Valco clone and I'd like to float my ideas on it here. Most of the simpler push-pull, early amps seem to follow the general arrangement of the schematic I've attached. It's the one I found easiest to follow, but if anyone knows of a better schematic? I have a large PT I'd like to use. It's got two 275V secondaries and two 6.3V secondaries. One winding of each is more than enough power as far as I can tell. 275 is .185 and the 6.3 is 3 amp. Obviously this requires a bridge rectifier, but I'm hoping to leave as much of the original circuit intact as I can after that. To take up the slack left by the lack of a field coil I reckon I will need a choke. I've read up on their use, but I'm really at a loss as to size and position - before or after the first filter cap? The only other mods I would be thinking of at this stage would be to make the two input jacks different from each other, and possible add as simple a tone control as possible. Any thoughts? Many thanks! .