There are many good amps both solid state and tubes as indicated in this discussion. However, the patented unity coupled output transformer in MAC tube amps is unique. It has the lowest distortion of any other push pull output transformer, and this does translate into very natural presentation. I always get drawn to the sonic presentation of vintage MACs, such as the MAC 1500 receiver, the MC 225 amplifier and the MA 230 integrated amplifier.
Gellis, the MC60, MC30 and MC240 are also desirable amps, but the 7591 output tubes in the MC225, MA230 and MAC1500 produces a sonic glow that is rather captivating!
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