You can run el34's in the audiovalve challanger 180 monoblocks and get 150 watts of class A power;install 6550's or kt88's and max out power at 180 watts;this amp drives my soundlab m2's extremely with the 6550's and kt88's as I have not listened to the el34's as of yet;Bobby of Merlin was quite interested in this amp when I asked him the question if any of his customers were driving Melin's with it.
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