Since the bias pots are removed on the VTA driver board, the connection to the AB bias can be made from the center hole of the old trim-pots,
if that isn't obvious (follow the circuit trace for 1/2" or look at the schematic!) So makes soldering a wire much easier!
This is exactly why I HATE written instructions. There are too many ways to interpret written instructions, so new instructions have to be written 2-3 times
for each person that doesn't interpret them the way that most people do. Learn DIY !! If you use the simple wiring diagram I can supply
you can see ALL of the connections on one page instead of reading thru 10 pages of instructions subject to your own level of understanding.
BTW, I'm no longer selling the AB boards, not enough demand, not enough understanding. Available direct from Pavel at