How do I add a second Bias pot to a SA300B

Wharfcreek

Jack of all trades, master of none!!
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Working on a couple of SA-300 amps.......one being just a 300 and the other a 300B. Have yet to plug these in....but prior to doing so I'd like to 'mod' one of them by adding a second Bias pot. Right now the factory set-up is one pot controls bias to both sides......by feeding both bias DC balance pots. I'd like to separate this so I can have a bias control for each channel......and still have the DC balance control as well. Has anyone done this or have any ideas on how it should be done? I had a Fisher 400/500 individual bias adjust mod schematic on another computer, but it had a hard-drive crash and all was lost on it. So, now kind of stuck starting over. Any help or advice would be appreciated. Many thanks, Tom D.
 
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