electrostatic amps are very different from dynamic amplifiers. For example the original stax T2 did not have regulated power supplies. The offset servo had a very small operating range. As much as a 2% line voltage change would clip the servo and the output DC voltage could be as much as +/-30V. People that own one of these have found out the hard way when changing tubes that adjustments are extremely difficult. The T8000 has a highly regulated high voltage to drive the input tube. Without this power supply the amp would not work.