Quote:
Originally Posted by Notimetolooz
That HV meter looks OK. I haven't seen that model before. Yeah, it could be the capacitor smoothing effect.
A quick and dirty way to check the audio output circuit is to touch the wiper on the volume control with a screwdriver with a finger touching the blade. Don't have the volume control turned down however. You should hear a hum. If this was a hot chassis set you definitely want it plugged into an isolation transformer to do this.
You would need a FM modulated 4.5MHz audio signal to inject to trace the signal further up (from the volume control towards the tuner).
A oscilloscope could enable you to trace the audio from the tuner toward the volume control.
Without those you are left with checking voltages, resistors and tubes, etc.
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I'll check the HV with the CRT in place, grounded and plugged in. I managed, after a 6 month wait, to get my hands on some Aquadag graphite with binder spray from Ted Pella Associates and I can spray any chipped or scratched areas although the coating on this CRT is pretty complete and undamaged.
I do have a scope and a signal generator. I can give those a try. Maybe Mr. Andersen would know if this is a hot chassis but I do have the hot and neutral blades of the power cord marked so I can be sure it acts as a keyed plug.
On the topic of the power cord, it's in terrific condition. Is there anything I can do or a treatment I can apply to help preserve the rubber and keep it from becoming hard and brittle?
Thanks
Chris