Shorted, grid to cathode (filament) in one or more of the tubes.
Pull them one at a time or install one at a time.
Let us know how you do.
Thanks
73
Jim W7RY
On 8/2/2020 7:23 PM, Tom Osborne Sr. wrote:
HI All
I have an AL-811h and it has been running just fine with about 600 watts
out with the amp on 110.
Today I turned it on and the grid current went negative with it in
standby. Shut it off real quick as didn't want to let the smoke out of any
parts.
What would make the grids go negative? A bias problem. Thanks and 73
Tom W7WHY
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