Quote:
Originally Posted by Leon Crampin
Beam tetrodes are noticeably better than pentodes in this respect - I suspect grid alignment gives higher efficiency and results in a lower g1 temperature. The 6BW6 and the 6CH6 are my devices of choice - unless there's room for an octal or loctal valve.
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I agree on this - the 6BW6 is basically a 6V6 in a 9-pin glass bottle and is a good substitute (with base rewiring/bias-resistor changes) for the EL84. It'll give you 5.5 Watts of output single-ended, push-pull a pair will give 30 Watts! And all for about half the heater consumption of the EL84.
Brimar seemed to get it right with the 6BW6 - Mullard/Philips never seemed to get the EL41/84 quite right even to the end.