Screen supply capacitor and bias caps

[olNick]

Thanx Steve, I'm using a separate cap here.

Hi Nick,
No, I wouldn't recommend that. Unfortunately the Standby switch works by disconnecting the plate and screen supply gnd. if you use that cap for the screen supply, the gnd will permanently be connected. The standby switch would still work for the plate supply, but not the screen supply (and bias supply). I'd be concerned that the screen would start acting like plate, since there was bias voltage, and the cathodes of the power tubes would still be connected to gnd.