Yesterday, 10:53 AM
The B+ voltage is low right from the transformer, so I have to ask are you using a dim bulb to limit the power? Second question: Can you verify that neither filter cap negative lead is grounded to the chassis? Have you noticed if the power transformer is very warm or hot? Is there a 5X4 rectifier tube in the power supply or is it a substitute? Try replacing the 5X4 if possible.