It's always useful to have more power available. KT150 gives you 40 W per unit.
I have no experience with the ARC amps but the Ayon Orthos XS with KT150 was sensitively better than KT88 or KT120 designs on demanding load. I assume the final result will depend on the speakers.
Anyway, if you love tubes, the Orthos XS delivering 300 W per channel in triode mode could be an interesting option...
Cheers,
Joël
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Audiophile Magazine founder and 6moons reviewer.
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