irfp240, irf240 outputs require NFB or 2A bias to eliminate crossover distortion. amplify the triode section with an NFB SS amp configured for unity gain.
Either discrete or opamp circuit the -3 to -.5 bias voltage does not cross zero.
The discrete tube/ss unity buffer is always in class A mode.
We cannot see inside the opamps but if always operating minus V then the opamp is probably operating in class B totem output.