You might have a cold solder joint somewhere on the chassis. You could with a magnifier have a look at solder connections and look for really small cracks at any connection points. You are probably making connection when turning. You could also look at the solder connections on the switch itself and see if they look alright.
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Sony Trinitron is my favorite brand.
My wish list:
Sony KV-7010U
Sony KV-1220U
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