I’m trying to use a 100 watt mid frequency amplifier to drive a piezoelectric load at 600 kHz; however they require an all positive drive voltage. The output is +/- 35 volts but I need 0-70 volts at ~2 amps. I’ve tried several techniques found here and elsewhere but they all require lots of power losses or use low power op amps. The amplifier has a standard 50 ohm output which I am impedance matching with hand made transformers. Thanks. Larry