Prototype sneak peak! This is very much a hacked up prototype on a Hammond biscuit tin and doesn't look like much but to get to this point is fairly massive. Most of the amp's "DNA" has now been figured out. Another working copy has been running outside of a case.

It's actually surprising how sparse it looks given the performance of this design. I feared it would end up being overcomplicated but it has ended up pretty simple and elegant. The PCB up top is basically just rectification and smoothing, some extra regulation is done inside. There will be an extra small PCB in that empty space underneath in the final version. Its function will be to configure the output transformer secondaries for 2 4 or 8 ohms.

The chassis only currently has an RCA input but the amplifier natively has a differential input stage, so the real one will have both XLR and RCA inputs.

The real amp won't have wires soldered directly to PCBs - this is a temporary hack as the wire-to-board connector system I originally wanted to use didn't work out so I've just soldered wires for now.