10-15-2013, 01:01 AM
I've a question. It has probably been answered before, but here goes:
Why do loctal tubes have designations like 7B7 or 14B7, when in actuality the filament voltages are 6.3 and 12.6, respectively? Were they running out of letter designations for 6 and 12 volt tubes by that time? I note that ones like 35Y4 use the standard filament voltages.
Why do loctal tubes have designations like 7B7 or 14B7, when in actuality the filament voltages are 6.3 and 12.6, respectively? Were they running out of letter designations for 6 and 12 volt tubes by that time? I note that ones like 35Y4 use the standard filament voltages.
