UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - When did Valve heaters change from 4v to 6.3v

Herald1360 · 10th Feb 2018, 5:22 pm

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.

10th Feb 2018, 5:22 pm	#2
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	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. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O Last edited by Herald1360; 10th Feb 2018 at 5:28 pm.