[Station X]

A couple of points.

1. The centre tap of the 600V secondary winding should only be grounded when SW2 is made or there's a shorting link wired across the EX.SW terminals. Grounding it directly won't make any difference to the PSU though.

2. The yellow wires from the 5VAC secondary winding should be wired to the heater pins of the rectifier socket. The yellow/black centre tap should be insulated and left disconnected. The same goes for the green/yellow tap on the 6.3V winding.

With no rectifier plugged in you should measure 600VAC ACROSS the anode pins and 5VAC ACROSS the heater pins. In practice the voltages will be higher as there'll be no load on the transformer.

Make sure there are no shorts across the HT supply due to leaky smoothing capacitors for example.