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#1
05-01-2013, 05:25 PM
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Why 6.3 volts?
Time to ponder a new question. Why did 6.3 volts seem to become the defacto standard for fillament voltage for so long ? Early radio tubes that needed 2.5 volts were run at 1.5 to 2.5 and we'll leave out series string for now. Was it a transformer thing like only takes one layer? Power? Na, power is the same we just jugle the volts/ amps.
Why 6.3? 
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#2
05-01-2013, 06:16 PM
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Seems like a coincidence that a car battery of the time was 6.3VDC. So maybe the choice of 6.3V was to enable the use of lead acid batteries for powering the filaments?
Dave
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