Re: Combined power-pentode and double-diodes?
Yes, but I don't remember coming across any radios with the EBL21 or its series-connected-heater version the UBL21 [55V@0.1A] that was intended for use in AC/DC radios.
I guess the whole poverty-superhet idea was doomed to oblivion.
I was always fascinated by the ECH21/UCH21 as an example of coercing a valve-design into a sub-optimal base-pattern; to provide enough connections they had to use the centre locating-spigot [which would normally be grounded] as an active connection.
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