Check. Won't use it. The only reason I thought of it was because when you install spark plug wires you dab a bit on the electrical connections prior to installing them. Didn't know if there was a similar use here.
Dielectric grease is used on non-conducting parts of electrical assemblies to block stray current. The pins of tubes need the best possible contact with the tube socket and dielectric grease couldn't do anything but hinder that.
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