OK, I have taken all the tubes out of the AL-572 and put only 1 in at a
time and turned the amp on each time, with the same results: a slight
negative pulling of the grid current meter and then a slow rise until
it's almost at zero. I also plugged in a never used tube that I received
from Ameritron Wednesday and it causes the amp to do the same thing.
I'd guess all these tubes cannot be bad, so what gives?
Also, a new twist- if I shut the amp down and then turn it back on
quickly, I don't get the negative meter pull - it just goes back to
reading slightly below zero. Slightly mean about .5 to 1 mm.
73,
Scott, N9AA
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