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Old 28th Oct 2021, 10:46 pm   #5
kalee20
Dekatron
 
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,059
Default Re: Projector valve amp trouble.

I've also known a case where oil had got into the lens assembly following the exciter lamp, and after 10 minutes or so started to vapourise due to lamp heat. This defocussed the narrow slit of light on the film soundtrack, causing muffled, weak, sound.

So, be sure it really is the amplifier before diving in!
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