Hi Ed,
I didn't use a train set transformer to replace the output transformer, I used the train set transformer's 16VAC output to find the impendance of a spare output tranny I had. It is the only AC output I have, apart from the obvious
I thaught about putting a resistor in parallel with the field coil but the Bush PB51 is a very simular circuit to the PB53 but it uses a PenA4 output valve (which is simular to my AC2/PenDD) it has a field coil of 2000ohms and it has a HT of 240v
so I don't understand why mine only gets to 190V
Regards
David