metaruss

Power supplies for the preamp. The 290VDC supply is on the left and the dual 300mA filament supplies are on the right. You can see the little 88VAC “booster” transformer on its side next to the 230VAC one. The filament supply’s torroidal transformer is to the right of them.  Top-left heatsink is the MJE340 transistor; top-right is a filament supply LM317; bottom is the plate supply’s LM317 on one side and the other filament LM317 on the opposite side.  Above the top heatsink is the IEC power connector/EMI filter and switched outlet relay.