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zenith 9s-367 question - Printable Version

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zenith 9s-367 question - murf - 07-22-2018

Hello fella's,
Have a question on a zenith 9s367 chassis that I brought home yesterday.
Upon looking it over, I noticed a .05 cap that was hanging by one end.
It is attached to pin 2 of the 6J5 detector tube and a 3 terminal strip above and to the left of the tube.
I am not seeing this cap on the schematic.
I see a C4 .0001mfd cap on the schematic.
Is there a reason that this disconnected cap was installed there?
It is not a zenith cap, so it is not original.
Was there an upgrade?
Otherwise looks like very minimal work has been done to this chassis.
murf

RE: zenith 9s-367 question - Radioroslyn - 07-22-2018

The schematic shows pin 2 to be connected to the chassis. Was probably used as a bypass cap for something. Would just leave it out and see if it devolves any problematic issues after service.

RE: zenith 9s-367 question - murf - 07-22-2018



RE: zenith 9s-367 question - murf - 07-23-2018

Will leave the cap out as suggested, but the radio is just putting out a lot of noise which varies from a beating noise to a squealing noise if I try to adjust the trimmers.
Seems like it may be an alignment problem?
Have replaced most caps so far and have check the cadohm and a bunch of resistors.
Have the other 12 tube zenith over at a friends for diagnostic and now have another zenith with strange issues.
murf

RE: zenith 9s-367 question - murf - 08-01-2018

Well, upon further investigation, i found that someone had removed the bypass cap.
Found a couple extra caps added that were not on the schematic.
Fixed those items and the radio now works great.
Never know what your going to find.
Murf