11-02-2017, 09:08 AM
Try wrapping an EF39 in tinfoil and putting an external wire down to pin1 to earth it.
Decrease in volume with rising HT suggests a screen grid problem on the output valve decoupling, How do all the voltages compare with spec?
How and why are you increasing the HT anyway?
Decrease in volume with rising HT suggests a screen grid problem on the output valve decoupling, How do all the voltages compare with spec?
How and why are you increasing the HT anyway?
Boater Sam.
