Here is a pic of the sockets. Does this look correct?
https://www.kuhlroad.net/572bSockets.jpg
-Kurt
On 2/21/2026 6:09 AM, gudguyham@aol.com wrote:
You did it wrong. The GDT do not replace the resistors on the grids.
You remove the resistors and the caps to ground on each grid to
ground on the tube socket. You directly ground the grid. Then one
GDT goes from rad filament wire to ground. That’s the way it’s done.
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On Friday, February 20, 2026, 7:19 PM, Curt Nixon
<radio.ku8l@gmail.com> wrote:
Look for a bad ground in the metering and or bias area.
On Fri, Feb 20, 2026, 7:12 PM Kurt Cathcart <Kurt@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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