*** I would start by measuring the full-scale deflection of the grid-I
meter with the amp unplugged, and recalibrate the meter if needed. I
would do the same thing with the plate/anode meter.
- If there are no glitch-protect diodes across the meter movements, I
would add them. Next I would measure the R of the 811A filaments to see
if they are intact. The reason I would do this is because I have seen an
AL-811 with open filaments in three tubes.
>...
good luck, Alan
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