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Right, i'm more worried about working on the inside of a medium powered pentode hifi amplifier with plate voltage around 500 dc and hi-current filament supplies. The crt can indeed hold it's charge plus build it back up weeks after power down..unless it's got a bleeder.
best zapp ive gotten yet was 120 mains at a porch light fixture which was wired with no ground. i was on a stair made of concrete with sneakers on. both hands were involved which is why this happened (a novice mistake, this was a few yrs back) one holding the fixture and one unscrewing the decorative cover's aluminum thumbscrew. for those interested, there was originally a ground stake in the garden for all the front lights but it appeared to be disintigrated(gone completely, with wiring still present but left unconnected to the ground plane) the house was made in 1910. Now I grounded it all to the cold water entrance below, via really nice 10awg solid core copper w/outdoors jacket inside metal shield.
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