Thread: When did Valve heaters change from 4v to 6.3v
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Old 10th Feb 2018, 6:54 pm   #5
dragonser
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Location: Carshalton, Surrey, UK.
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Default Re: When did Valve heaters change from 4v to 6.3v
Hi,
this is all very useful info, thank you !
I guess the transformer might be older than I thought it would be.
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