[Amps] Negative grid drive

[Jim]

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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