[Amps] al811h reverse grid current

[Curt Nixon]

Look for a bad ground in the metering and or bias area.

On Fri, Feb 20, 2026, 7:12 PM Kurt Cathcart <Kurt at kuhlroad.net> wrote:

> Several months ago a seem to have a 572b go bad.  I replaced it and also
> replaced the resistors with GDTs (amoung other mods).
>
> Now I'm getting reverse grid current and the GDTs and lighting up.  I
> put in a net set of 572b and am getting the same thing, The view of my
> Sockets matches the picture on the Instructions .
>
> Advice?
>
>
> -Kurt
>
>
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