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RE: A tube journey with lesson learned, Re; KT88 & KT150

And the Berning designed Audionics BA150 was rated at 150 watts with similar tubes although that rating was with only 100 volts AC. The amp put out 225 watts at higher AC. I also know from a friend who was around David Berning at that time(he made David's first preamp) and he told me the BA150 prototype was turned on in 1072 and finally turned off in 1977 with no measurable wear on the EL-509 output tubes.

Another user of similar tubes(EL-519) was Melos who made monoblocks with 4 output tubes rated conservatively at 400 watts. And I should add the tubes(both Melos and David Berning) were screen drive resulting in output curves that were triode like.

The problem though with high output from these tubes is that the screen drive demanded high current drivers meaning you needed solid state drivers for maximum output. The EA230 was a second generation BA150 with a tube driver stage resulting in about half the output of the BA150 since a tube driver stage was limited in current drive.

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