First get the serial number and find if it has the extra pots. The early models also had a zener diode pair at each input on the board, they have a tendency to short. The best thing to do is remove them as they were not used in later production. I replace the caps on the input board with Nichicon Muse ES and KZ series. Will match replacement caps to schematic when we get serial number.
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Terry DeWick
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