8W/channel ultranlinear; 4W/channel in triode? Damn--that's a tube arc welder! What does it sound like? You know, w/90 ohm output impedance, that qualifies as a high impedance tube amp, even though it has transformers. Tube amps & SS amps sound pretty different, even when volume levels are matched. It's just a totally different sonic landscape. Impedance is one of the factors, but IMO not the main one.