Another SS Dynalo lives. 20 VDC rails 255 235 ohm bias resistors. (see EDIT)
Running single ended input and balanced output which, using the same Buffalo II/Ivy DAC, does give up something to running fully balanced.
EDIT: With 255 ohm bias resistor on 20 VDC rails, the temperature on the output devices reached 95C after 90 minutes running with the chassis cover on. At that temperature the MPSWx6 max dissipation is derated to about 440mW. Even though they may be still running at the edge of their operating range, the amp sounded lean and harsh. Had to lower the bias resistor to 235 ohm which, upon fully warmed up, yields about 14mA current and the BJT case temperature is at a more reasonable 75C.