Yes, there is additional small feedback board were are the feedback resistors (R37) but don't wary that will be included in the price and delivered with the main board.
As Arthur mentioned there is possibility to replace that feedback board with the balance inputs board, but I don't have any spare. If there will be interested I can order some more later.
This amp was designed as CFA with one input (unbalanced) and in most cases in domestic use it's perfectly good in that way. Later I added small board (replacing FB board) and added balanced inputs so called hot and cold inputs (+ and -). This is described in this thread, try to find it, there the links in first post but look here: https://www.diyaudio.com/forums/solid-state/243481-200w-mosfet-cfa-amp-123.html#post5311565
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PS regulator board order list:
Arthur PS regulator board 4pcs...….OK
zsaudio PS regulator board 2pcs.....OK
mlloyd1 PS regulator board 2pcs.....OK
Vitalica - PSU PCB 2 pcs ...…...OK
tjencks- PSU regulator board 6pcs....OK
Lbud4- PSU regulator board ……..2pcs
malibutwins PS regulator board 2pcs.....OK
Arthur PS regulator board 4pcs...….OK
zsaudio PS regulator board 2pcs.....OK
mlloyd1 PS regulator board 2pcs.....OK
Vitalica - PSU PCB 2 pcs ...…...OK
tjencks- PSU regulator board 6pcs....OK
Lbud4- PSU regulator board ……..2pcs
malibutwins PS regulator board 2pcs.....OK
Ronaldo, just few post back (#1351) I showed how to find it from the first post index. Actually index shows other instructions about this amp.
