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Crooner,

55 mA. at 440 VDC P-K ( amp uses fixed bias as I recall ) is 24.2 Watts dissipation of the EL-34. Looking up Mullard data sheets, they list 25 Watts as the EL-34's Maximum plate dissipation, in pentode mode.

If my math is correct 24.2 Watts is 96.8 percent of Maximum. Can we truly call that conservative operation ??

Jeff Medwin



Edits: 03/22/17

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