[ARC5] 7V and 14V Tubes

[J. Forster]

5Y3; 5U4; ....

-John

===========



> Actually the Loctal Tubes with 7V and 14V filaments were indeed meant for
> 7V and 14V filament voltages.  They work OKay on 6V and 12V but were meant
> for the 14V and 28V voltages used in aircraft.  Of course, aircraft
> applications typically used the filaments powered right off the DC power
> buss while AC line operated radios used them either in a string or ran
> them off of a transformer.
>
> And I recall seeing a tube spec sheet that said the 7V filament tubes
> lasted longer that the 6V ones if used with 6V filaments.  So 7V tubes
> were an "improved" 6V as well as being more suitable for aircraft or
> vehicle use.
>
> Only recently I discovered there are some 5V filament tubes around, too,
> and I have no idea why....
>
> Wayne
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