Re: multi-supply audio amp

"john larkin" <jl@glen--canyon.com> wrote in message news:e7uqnjlhaesulfrqc7n6q961degb556kga@4ax.com...

I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
>
What was that called?
>

About ten years ago someone asked me if I could repair an audio amplifier, which I did by replacing a shorted output transistor and
a few associated components.

The topology was that a conventional class B circuit had the + and - halves of the output supplied initially by a few volts from a
linear regulator followed by a regulator switching synchronously with the audio waveform to keep the collectors a few volts above
the required audio output.

Unfortunately I can't remember enough to find an online reference. Not sure it was called anything specific.