Novanta,
The input and phase splitter will likely only draw a few mA each. The EL34s will likely be biased between 40 to 60mA each. So a stereo amp could draw as much as 250mA from the power supply. But you will want more than 250vA on your transformer B+ winding. Usually 20% to 40% more is recommended. Even with bias set at 50mA per output tube a 250vA rating on the power transformer is a bit too low. If you are building two mono amps, 250vA is more than enough.
Regards, S.
The input and phase splitter will likely only draw a few mA each. The EL34s will likely be biased between 40 to 60mA each. So a stereo amp could draw as much as 250mA from the power supply. But you will want more than 250vA on your transformer B+ winding. Usually 20% to 40% more is recommended. Even with bias set at 50mA per output tube a 250vA rating on the power transformer is a bit too low. If you are building two mono amps, 250vA is more than enough.
Regards, S.