>I removed the chassis from the case to first find the ALC
>electrolytic capacitor strewn about the bottom in confetti and
>foil.
:There is no such capacitor in the ALC circuitry -- in the 110VDC
supply,
:yes.
Correct, wrong label and most of the 110 volt supplies measure close to
120 vdc resting.
>Parasitics and or a tube problem might be the next thing to
>investigate.
: Parasitics that are intermittent are not easy to investigate.
It's interesting that the excessive voltage happens after both tubes have
been sitting on for a few minutes. As soon as I get more time to set
things up, I'll have the spectrum analyzer log what it sees.
>The unit fired up without tubes showed no problems at the
>alc point, then each tube was tried in individually at both
>locations. Again, no abnormalities observed.
:Be sure to remove the wire between the bias contacts on the relay and
the
:110VDC power supply. If you don't do this, a shorted tube can easily
:destroy the filament transformer.
In your opinion, would a series glitch resistor in the bias supply
prevent xmfr damage? Since the meters are near hens teeth to replace,
I'd like to protect the movements if possible. I hope to work up a
circuit to do that properly. Notes in the original owners manual about
the meter movement values to follow once I confirm them.
thanks
skipp
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