Today made more progress as managed to build one of the 4-65a raw filament supplies. They weigh a ton so decided to build monoblocks for all filament power supplies as well as the main amp.
The power supply is built on a piece of wood. This is a fast method for breadboarding the amp which provides fantastic results. I’m using PTFE sleeved wire for the first time. This is rated 600V and 10A, sufficient for the requirements here.
The common-mode choke is built under the capacitor arrays to reduce wire length and optimise space use.
The choke and 200VA transformers are bolted directly to the board.
The Schottky rectifier bridge is mounted on an 4mm alumminium angle which is primarily used as heat sink and also the solid structure helps to mount the first capacitor array very close to the bridge.
Tested the supply with a dummy load of 3R3 50W. Ripple is only 53mVpp which will be dramatically reduced by the Rod Coleman filament regulator.
Edit (28th December 2012)
Just made a minor adjustment of the output voltage by the addition of R1 and R2 and fuse F1 was increased to 2A to avoid blowing it at full load when switched on:
