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Originally Posted by everstan
Perhaps you pros could help.
I have the 1951 Zenith 19" porthole with the 24H21 chassis. The flyback rings good and ohms check but the secondary is suppose to put out about 525 volts to send into the 6W4 damper tube. There is about 350 volts of B+ going into one side of the flyback as it should according to schematics but where it should come out as 525 it is about 300 volts. No HV. The only thing I can think of is that when I received this set the assembly the 1B3 rectifier sits on came loose and I don't have it hooked up right. I rewired the socket but I still have that nagging question...what do you do with the wire that emerges from the metal cup the 1B3 rectifer socket sits on? Can someone please open up their flyback cage on their porthole for me.
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It should look like there are 3 wires emerging from that cup. One is the anode, and the other two form a loop that wraps around the flyback to supply the 1B3 heater. You're either missing your anode lead, or your 1B3 is cold.