On the whole it has turned out great but one problem I'm left chasing is the balance control, which keeps going intermittent despite being carefully disassembled and cleaned.

Since 750K M-N taper balance pots of high quality appear to be as scarce as unicorns, I am looking at putting in an 11-step 2 pole rotary switch, with resistors.

I recognize that to work like an M-N taper, each deck should have six of the 11 positions with no resistors, in mirror image (opposite directions) to one another, with the center position having no attenuation of either channel.

I also understand that the "taper" of the remaining five positions that will have resistors should be logarithmic, but that's where I start to get lost - abstract math has never been one of my areas of skill/comfort.

Can anyone please advise how I would "taper" 750K over five positions to work like a logarithmic balance control? Or a "for dummies" way that I could calculate it?

Thanks in advance!