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RE: RCA 5691 Vacuum Tube

I'm not sufficiently familiar with these tubes to answer specifically. However, every dual-triode octal tube I've ever seen that had heavy use has exhibited two brown spots on the bare glass directly above the filament windings. I have never seen such spotting with tubes that were top-gettered like these. That might be an indication that the spots on your tubes were not caused by use.












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  • RE: RCA 5691 Vacuum Tube - Triode_Kingdom 16:39:52 07/22/21 (1)
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