Quote:
Originally Posted by radio nut
I put another rectifier tube in and the b plus is zero, beginning to think the transformer is bad. The negative side of the electrolytic caps is now 489 volts.
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The N/A schematic is lacking page 12-16. That's where all the voltage data is!
Remove rectifier tube and measure the HV winding resistance, about 400 ohms. Of course, with the power disconnected.
That Zenith has a strange approach to the grid bias circuit. You have to go through the entire power supply to make sure there isn't an error in the wiring, easy enough to do!
Also, make sure the speaker field coil checks good, 1250 ohms.
