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*Moderator* --please move this thread to the Rectangular & solid state Tv forum--
Welcome Joe!
You have preserved that set well, absolutely beautiful cabinet. I'm not positive, but i think the 44 was a modular chassis so your troubleshooting will be easier once you pull the sound module.
If the volume control has shown no sign of being oxidized in the past (scratchy volume control) then I would suspect either a driver/ output transistor or output capacitor on the sound board. If you have access to freeze mist, I would spritz each component, waiting a minute between each one and see if you can reproduce the symptom that occurs when the set is first turned on. When the sound goes away, you've found the defective component.
If that doesn't work, you will need to pull the sound board and troubleshoot it.
Judging the operating condition of the set, I assume you've worked on sets like this before?
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Jordan
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