Our new green technology valve hybrid amplifier is in the test stage now. It may take a while :). The sound, power and functionality are very promising. Gregor wants one for himself. Power 220W per channel into 8Ohms, lots of current. Pure class A driver-without NFB, yet with a dose of PFB- Double triode drives directly a 442kHz PWM modulator which in turn drives high current, super fast FETs. Totally analogue with a passive output filter which removes the HF carrier and....music happens in any speakers. Efficiency 85% - energy is not wasted.