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Sorry, I shoulda been more specific. 'Ground end' simply means the lowest potential or no-signal end. In this case, there's a 40 ohm resistor (R22) from there to chassis ground. See if there's 40 ohms from the low end lug of the control to chassis.
(R22 may be physically distant from the control since it's part of the negative bias supply circuit.)
Last edited by old_coot88; 06-24-2020 at 05:42 PM.
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