Thread: When did Valve heaters change from 4v to 6.3v
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Old 14th Feb 2018, 5:38 am   #12
Radio1950
Hexode
 
Join Date: Apr 2017
Location: Buderim, Queensland, Australia.
Posts: 428
Default Re: When did Valve heaters change from 4v to 6.3v
Its a great question, not stupid at all.
The history answers we get from the guys is fascinating.
Thanks for asking.
Mike
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