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40-201 oscillator not working.
#15

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


Messages In This Thread
40-201 oscillator not working. - by Tomie - 04-30-2020, 03:15 PM
RE: 40-201 oscillator not working. - by Tomie - 05-11-2020, 10:19 AM
RE: 40-201 oscillator not working. - by Tomie - 05-12-2020, 12:32 PM
RE: 40-201 oscillator not working. - by Tomie - 05-12-2020, 12:38 PM
RE: 40-201 oscillator not working. - by Tomie - 05-16-2020, 10:35 AM
RE: 40-201 oscillator not working. - by RodB - 05-16-2020, 11:33 AM
RE: 40-201 oscillator not working. - by Tomie - 05-16-2020, 01:26 PM
RE: 40-201 oscillator not working. - by RodB - 05-16-2020, 04:17 PM
RE: 40-201 oscillator not working. - by Tomie - 05-16-2020, 05:08 PM
RE: 40-201 oscillator not working. - by RodB - 05-16-2020, 06:02 PM
RE: 40-201 oscillator not working. - by Tomie - 05-17-2020, 11:57 AM
RE: 40-201 oscillator not working. - by RodB - 05-17-2020, 05:03 PM
RE: 40-201 oscillator not working. - by Tomie - 05-18-2020, 11:13 AM
RE: 40-201 oscillator not working. - by Tomie - 05-18-2020, 12:15 PM
RE: 40-201 oscillator not working. - by Tomie - 05-18-2020, 05:09 PM
RE: 40-201 oscillator not working. - by RodB - 05-18-2020, 07:43 PM
RE: 40-201 oscillator not working. - by Tomie - 05-19-2020, 12:54 PM
RE: 40-201 oscillator not working. - by RodB - 05-19-2020, 03:56 PM
RE: 40-201 oscillator not working. - by Tomie - 05-21-2020, 06:03 PM
RE: 40-201 oscillator not working. - by RodB - 05-21-2020, 09:03 PM



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