120w mains transformer with 4 x EL34's

[martin manning]

Ok, that looks good. You will get ~480VDC from a FWB with that input voltage. Still don't understand the low plate and screen voltages shown on the schematic.

[Phil_S]

You could easily see 3-5% variation in line voltage depending on time of day. Earlier you said 354, now 343.5. That's only 3%. With the current heat wave, you should expect lower line voltage during the day. With additional info from Martin, I can see where 3.2KΩ is reasonable for the OT primary.

[wpaulvogel]

If it were me, I’d feed 100 volts into the full primary and measure the output voltage from the speaker leads but that’s just the way I do it.