I remember taking measurements on the high/low pots out of one that I modded, I will try and find the numbers, but can’t promise anything since it has been awhile. It sticks in my mind that they were very close together and somewhere near the 6k and 6.2k mark. Really, just set them to the middle and turn one or the other slightly off. For the other modifications (knobs) you can find the original schematic on the web and get the values there. Use your DMM and turn the knobs to match the resistance on the schem.
