The output shown was for an input voltage of 12V and a 300 ohm load after the filter. The amplitude of the output wave was only 14V pkpk, a discrepancy easily explained by the low ratio of sine wave to triangle wave control signals. Once tuned for high voltage peration, the gain on the noninverting amplifier for the reference sine will be increased to output a 340V pk-pk signal when the input is 200V. If necessary, the frequency of the signal can be adjusted by changing resistor values in the sine wave generator (Bubba) circuit.