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Sounds as if you limited the 25 volt heater of the 25Z6 to a little over 6 volts (or whatever the diode is designed for) likely killing B+ to the vertical circuit.
The diode needs to be installed accross the heater pins of the crt, not the rectifier. Pins 1,11 of v21, not pins 2,7 of v20.
jr
Last edited by jr_tech; 12-16-2019 at 09:14 PM.
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