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Scott 299B balance potentiometer question

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Looking for advice on replacing a troublesome balance pot on my Scott 299B integrated. I have deoxed the pot and still have some intermittence.

My question is: there is an extra terminal opposite the wiper terminal. On the schematic is says "1meg tap @500k" with an extra line on the wiper symbol.

I have not had any luck finding a 4 terminal pot. Is it possible to replace it with a three terminal and do some rewiring to make it work.

So, looking for advice from others with more experience than I!

I have schematics but cant seem to get them uploaded

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