This circuit was intended to address some of the perceived deficiencies of the original circuit. These were unsymmetrical slew rates and lack of drive from the voltage amplifier stage under heavy loading (not realistic for normal mortals). So I made the voltage amplifier Push Pull. This solved the slewrate problem and generally tided up the performance of the amp. On audition however the sound had changed. Only subtle but again reduced was the transparency that I had come to appreciate in the original circuit.