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OTL, Output Transformerless Amplifier User Group.

RE: OK- its an older 12-tube model

Are you OK with checking voltages as you did in the M-60?

You don't have to remove the bottom cover. Just take a power tube out of the socket from the left bank and one from the right bank. Then locate the index of the socket and count 5 pins clockwise; that is one of the grids of the power tube. What is the voltage? You can measure it with respect to the chassis.

We need the grid voltage on the left and right banks.

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