Re: Combined power-pentode and double-diodes?
EBL21? Quite a few Continental sets featured an ECH21, ECH21, EBL21, rectifier line up, taking advantage of the second ECH21 triode as first AF amp. Others just used the high gain of the EBL21 pentode to continue the short-superhet theme. Admittedly, this series of glass base valves was superceded fairly quickly post-war without an EBL21 successor.
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