Quote:
Originally Posted by Ed_Dinning
Hi, try checking the heater voltage applied to the valve is correct with a good meter. This can vary a lot if your mains is also varying. The transformer I designed for the Sussex has multiple primary taps to get over this problem, but will not compensate if the voltage is varying rapidly, or if the mains waveform is poor (not sinusoidal) as can happen with heavily loaded power systems.
For accurate results a true RMS meter is needed.
Ed
|
All voltages (including heater) are correct (at least when no tubes loaded). I'll test voltages on other socket with tube loaded. I assume I should always measure voltages in "Test" mode.