As a current SET owner my Audio Valve Challenger Class A tube mono amps sound much better than any SET I have owned and I have owned over 30 SET amplifiers. SET are just a wee bit better in the midrange and its slight but everywhere else the AV stomp on my SETs.
Which amp matches best my JM Lab Mezzo Utopia ?
I have clearly a predisposition to single ended and Class A design. Push pull does not apply. The speakers are a demanding load though. They go down to 3.8 ohms.