Picture showing underside

Note grounding of cathode resistors using solder tags and a coarse ground wire instead of relying on screws on stainless steel.
Solid State Relay used for power control, needs a few mA from preamp to activate.

IEC inlet replaces "knot-on-cable" as used on original ST-70, now ordinary power cables may be used.

Pictures taken during building, shows IEC inlet.

Replaced speaker connector with a ( screwstrip or whatever it's named )
Feel trapped ?