Quote:
Originally Posted by paulsherwin
I suspect the manufacturers had trouble cramming a power pentode and a couple of diodes into a B8A/B9A envelope, at least at first.
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Yes, it would have been a bit of a struggle - but as noted upthread they managed to fit a low-power pentode and a half-wave HT rectifier into a small space....
Even in the Octal days, I'm amused to see that the basic EL33 pentode took only 0.9A@6.3V heater but its dual-diode-pentode sibling the EBL31 needed a massive 1.5A@6.3V for its heater!
Needing 0.6A@6.3V additional heater-power just to drive a couple of signal-frequency diodes seems to be getting a bit louche and bordering on the profligate!
What was going on there?