As a total aside here, you know what I still love about tube/valve amps? THE LOOKS when they're powered!!!!! My ears now as they are, the inevitable response dips at 4kHz into a typical modern speaker will work badly against me, so eff the sound and whatever 'magic' these old amps put in... I have a pair of fully rebuilt (sensitively by Glenn croft) Quad II's. I must bring them down and play them again for old time's sake. They have a 'glorious(ly coloured)' midrange and soft highs which won't favour the speakers here, but they do look fab when powered in a compact less showy way. The GEC KT66's cost a bomb though now, so I only get these amps down for use very occasionally in the twenty five years I've been custodian of them.