Re: When did Valve heaters change from 4v to 6.3v
Mid-late '30s? Some UX American types were 6.3V, then octal types generally were.
If the 2-0-2 windings are similar, all of one plus half the other will give near enough 6.3V to be OK as long as current drain is within their ratings.
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Last edited by Herald1360; 10th Feb 2018 at 5:28 pm.
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