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Nice clear pix. So far the grid wiring to the 6Q7 looks OK. Should not be any high voltage in the pot to arc. The arcing you hear may be in the switch. Probably no way to wash out the switch as it's enclosed, but maybe better not to as there's grease in there. With the set unplugged you could try switching on and off a dozen times to see if that helps clear it. It's possible to drill out the rivets and disassemble the pot and switch and check the switch contacts and clean them etc. but it's a bit watchmakerish to do. For now I'd let it go and you might want to just replace the pot/switch later on if the crackling persists. If the pot seems stiff a drop of light oil on the shaft where it goes into the threaded bushing should help: tip the chassis with the shaft pointing up.
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Reece
Perfection is hard to reach with a screwdriver.
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