05-17-2020, 12:57 PM
B+ trace from rectifier to resistor #33.
These measurements taken from chassis ground, not B-. Voltage readings are what it is after the described component.
B+ out of rectifier, new electrolytic capacitors, 361.5 VDC.
1K dropping resistor to bring B+ closer to schematic, 292 VDC (I added this after recapping).
Speaker field, 230 VDC.
1K ohm resistor, illustration #35, 215 VDC.
4.7K resistor, illustration #33, 173.5 VDC (Measurement taken from pin #3, 7J7. There is very little voltage drop across the high voltage side of coil, #28).
The voltage across resistor #33 has remained consistent at about 175 VDC (about 40 or so volts drop across the resistor). That measurement was taken from pin #3, 7J7.
1232/7G7
-.73 VDC/1.1 VAC grid (pin #6).
195.3 VDC/ 1.5 VAC plate, (pin #2)
146.8 VDC/0 VAC Screen Grid, (pin#3)
2.35 VDC/.171 VAC cathode, (pin #7)
Wafer switch pin # B6. About .01 VAC.
What tests could I make to determine if 7J7 is working?
Tom
These measurements taken from chassis ground, not B-. Voltage readings are what it is after the described component.
B+ out of rectifier, new electrolytic capacitors, 361.5 VDC.
1K dropping resistor to bring B+ closer to schematic, 292 VDC (I added this after recapping).
Speaker field, 230 VDC.
1K ohm resistor, illustration #35, 215 VDC.
4.7K resistor, illustration #33, 173.5 VDC (Measurement taken from pin #3, 7J7. There is very little voltage drop across the high voltage side of coil, #28).
The voltage across resistor #33 has remained consistent at about 175 VDC (about 40 or so volts drop across the resistor). That measurement was taken from pin #3, 7J7.
1232/7G7
-.73 VDC/1.1 VAC grid (pin #6).
195.3 VDC/ 1.5 VAC plate, (pin #2)
146.8 VDC/0 VAC Screen Grid, (pin#3)
2.35 VDC/.171 VAC cathode, (pin #7)
Wafer switch pin # B6. About .01 VAC.
What tests could I make to determine if 7J7 is working?
Tom