Reviving an old full wave rectifying valve

[Brianc]

For testing purposes as I suggested in post #16..... the valve base would be open at the top, plenty of air, a 4 ohm 10 watt wouldn't get too hot, it would be for testing the rest of the PSU before Nick plugged what might be a hard won U10.

Lawrence.

I'm sorry, Laurence. I missed the point that this was for test purposes only. Has measuring the voltage across the heater winding/resistor when the test fixture is in operation? It should be 4VAC.