I’m an AR I50 buyer and I want easy or auto bias and don’t want to mess around with tubes, changing or rolling tubes. The tube rollers and tube biasers may want to focus elsewhere.
But I really want the AR sound in something I can afford and a simple good looking integrated ......and the proof is in the listening - when I heard this amp driving Maggie 1.7i speakers the sound was clear, detailed, spacious and sounded terrific.