r/diytubes • u/AutoModerator • 15d ago
Weekly /r/diytubes No Dumb Questions Thread - October 02, 2026 to October 08, 2026
When you're working with high voltage, there is no such thing as a dumb question. Please use this thread to ask about practical or conceptual things that have you stumped.
Really awesome answers and recurring questions may earn a place in the Wiki.
If you'd like to nominate a comment to be included, just reply [Wiki] (with the brackets)! The mods will be automatically notified that something awesome just happened.
As always, we are built around education and collaboration. Be awesome to your fellow tube heads.
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u/Steelhorse91 15d ago
Is there anywhere with a basic guide on safe separation distances between terminals, or PCB traces for given voltages of AC and DC?
I have a Trace Elliot Hexa Valve amplifier that runs 685V on the plates, and while I was recapping it, I discovered what appeared to be factory applied dialectic grease around the plate and screen solder lugs of the tube sockets. Just wondering is that was just a belt and braces move, or is dielectric or heat shrink 100% necessity at those voltages (with non top cap tubes at least).