sahlomonic":f8gfiw70 said:
I thought I read that Scott Splawn himself said the B+ and old switch cannot be retrofit, but the mid cut is an available retrofit option for older amps.
Yep
Here are his exact words from his board.
"Hey Guys
The mid switch is the only option that we could do on all the amps we have built. The Drop B+ switch depends on the power transformer that is in the amp and the old/new switch has to have the latest PCB, some 2014 and all of 2015 would work. When you switch to the Drop B+ you will not have to change the bias, the switch takes care of that."