We're not big fans of phrases like 'THE BEST' or other such hyperbole. As we all know, an amp or anything in the audio chain, is just that...a link in a chain. That understood, the finest sounding single ended amp we've heard and used in the context that calls for that design ethos, is this pair of monos from Trafomatic. These are the units prior to the case being installed around them. 2-3 stages and tremendous voltage. They can operate at 50 watts class A-1 or 145 watts class A-1, with tremendous reserves. (think 2500 volts on the tubes, or in car speak, 'unbridled torque'.