Between semesters I was working for a co. that handled A.V. repairs for the NYC public schools. I perused their OEM files and service bulletins. One from Rheem Califone mentioned a model of their portable phono/PA units using 6L6 metal tubes causing shocks due to "capacitive conduction" internal to the tube. It sounds to me like it was really the sort of thing you experienced. The company offered free 6L6G replacements.
RobNYC
On Sunday, October 15, 2023 at 07:14:30 PM GMT-5, Tony Miklos via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Working on a Seeburg JL with metal cased RCA 6L6's. (don't recall seeing those before) While trying to find an intermittent very loud snap, crackle, and pop, I get a bit of a shock off the metal case of the one 6L6. Turns out the plate is shorted to the metal enclosure! The base must be a little small because the tube clips weren't grounding out the B+, although it may have been intermittently and that may have been the noise it was making. Put my meter on it and it was about 395vdc to ground, .1 ohms from pin 3 to the metal case.
Tony
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