Following the terminal exit of the main power transformer the opportunity was taken to upgrade and almost rebuild it.
The main power transformer was replaced by an external dual mono PSU, containing 6 mains transformers; two for the HT to the 2A3 power valves, two for the HT to the 6072A-5687 input/driver stage, and two for the negative bias supply for the grids of the 2A3s.
EZ81 rectifiers, choke input and first smoothing cap for the input/driver stage power supply are inside the PSU case
Four umbilical cables connect the psu to the audio chassis
Independent left and right mains switches, with remote switching controlled form the audio chassis
Removal of the power transformer from the audio chassis allowed for a pair of larger chokes to be fitted for the 2A3 HT supply, each channel has NOS GZ37 choke input supply and Elna Cerafine HT caps in the HT, and NOS Mullard EZ81 and choke input supply for the bias supply
Inside there was a major component refresh and upgrade; tantalum resistors, Hovland Musicaps, lots of Black Gates, Jensen 4 pole HT caps, Kemet bias supply caps and silver wiring
Not looking to shabby for it's age, and now fit and ready to go