05-06-2022, 08:54 PM
Finally able to get back to working on the chassis for this Westinghouse N-202. But I have a problem....
[Image: https://www.dropbox.com/s/5kwh5rdom76a0r....jpg?raw=1]
When I first powered it up I knew the 6SA7 tube tested bad on one of its test settings but tried it anyway. The set has sound with the normal static but was not picking up stations. I then put in a new good 6SA7 and was receiving stations on the AM band. It lasted about 30 seconds or so. I rechecked the 6SA7 tube and it was still testing OK. A few days later I fired up the set again and it was now picking up AM stations and sounded OK for about 5 minutes but then stopped receiving. I did an oscillator check with another radio and believe my oscillator circuit is not working. Cleaned the band switch. Checked voltages (see the schematic below with voltages in red in the "voltages at sockets" box in the schematic.) Rechecked caps and resistors around the oscilator circuit and ohm checked the oscilator transformer and things look ok but I can't figure what is giving me the low voltage on pin 4 of the 6SA7 and that may not be the problem either. I'm not sure what else to do at this point. Any suggestions are welcomed!
[Image: https://www.dropbox.com/s/db4xi4i6izd1te....jpg?raw=1]
[Image: https://www.dropbox.com/s/5kwh5rdom76a0r....jpg?raw=1]
When I first powered it up I knew the 6SA7 tube tested bad on one of its test settings but tried it anyway. The set has sound with the normal static but was not picking up stations. I then put in a new good 6SA7 and was receiving stations on the AM band. It lasted about 30 seconds or so. I rechecked the 6SA7 tube and it was still testing OK. A few days later I fired up the set again and it was now picking up AM stations and sounded OK for about 5 minutes but then stopped receiving. I did an oscillator check with another radio and believe my oscillator circuit is not working. Cleaned the band switch. Checked voltages (see the schematic below with voltages in red in the "voltages at sockets" box in the schematic.) Rechecked caps and resistors around the oscilator circuit and ohm checked the oscilator transformer and things look ok but I can't figure what is giving me the low voltage on pin 4 of the 6SA7 and that may not be the problem either. I'm not sure what else to do at this point. Any suggestions are welcomed!
[Image: https://www.dropbox.com/s/db4xi4i6izd1te....jpg?raw=1]
