Okay, I think I understand. The Yamaha DSP-A3090, DSP-A1, RX-V1, RX-Z1, and even RX-777, RX-797, are about as good as the modern Yamaha A-S801 or 1000 amps because they use similar multiple BJT transistors in the final output stage and EL transformers. Only the MOSFET and toroidal versions like...