More Help Needed on SB401

[Dan Pividal N4VET]

I have now noticed that the grid fluctuates on the meter as I tap on the
boards.
The plate does not show any movement when I tap.
I have checked all tubes and tube pins.
I have cleaned relays.
I have sprayed contact cleaner on all controls.
And, I have checked ground on the boards.
I added additional ground wires to the trace on the boards and connected them
to ground.
I have subed all tubes.
What is causing this problem must be the size of a hair.
And, must be a part that vibrates at the slightest of taps and it controls
grid cur.
This is a real mystery.
Dan

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