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I was with Radiotvnut testing a 21" Predicta tube years ago (in a 4240 raped by scrappers.) The chassis had a sticker indicating it had been converted to 6.3 volts. Well, the damn neck lit up like a hi-beam before I threw the voltage control down. Didn't burn out the filament but have always started on 2 volts testing those tubes since then.
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