Re: "Double anode" triodes/tetrodes.
The ECLL800 is a double-pentode-plus-a-triode; though there are two pentode-anodes, there are also two pentode control-grids (so it's essentially two pentodes in one envelope, sharing a common cathode).
The 'double-anode' valves I'm really pondering on have one control-grid but two anodes, whose anode-currents are controlled by that one grid.
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