The PCB is 9 5/8 x 3 " or
245 x 75 cm ?
Kasper had made a couple of boms for Mouser & Digikey
but i don't have anywhere to host them but i can email them if anybody need them , host ??
Gain switch [ shorting i think ] any 12 pole although there was
disscussion and a calulator offered for making 24 position values ,
for switching relays thats simple
[ Credit where due , Sammy G , the swiss offered up his calculator ,
for gain , that's not Power , so don't think about taking over any countries
with your Audio , but it may no be available any more , search the threads
The power transformer depends on what d.c. volts you want and if the
opamps selected can handle it , but to get phantom might need something
in the 22-0-22 range guessing at .2 to .3 amp
We are on our own for a psu , but Fabio , Keith ssl , and Green pre
have versions that will work .
For other questions some looking at the schematic is required
[ i'm in the same boat ]