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Questions about tubes and gear that glows. FAQ

RE: JJ EL509S

But if you drive the screen of an EL509 it becomes a triode and the curves are triode curves. McIntosh uses it as a pentode. Both Melos and David Berning used screen drive and had over 200 watts from a push/pull pair in triode. The Berning amp was the Audionics BA150. It was listed at 150 watts but that was David being conservative and testing with 100 volts AC into the power supply. Plus Melos produced triode mono blocks with over 400 watts triode from four EL519 tubes but only advertised 400 watts.


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