Thread: When did Valve heaters change from 4v to 6.3v
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Old 10th Feb 2018, 9:25 pm   #6
Herald1360
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Location: Leominster, Herefordshire, UK.
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Default Re: When did Valve heaters change from 4v to 6.3v
It looks '30s ish. Not well stored either, but should be fine if it's well dried out.
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