I suppose a torroidal power transformer(s) can be made to fit in a single rack height chassis that has the needed power capacity. Also, some bipolar output transistors such as the MJL21193,4 complimentary pair, the MJL2115,6 complimentary pair and the MJL3281A, MJL1302A complimentary pair can operate with low bias current and have low distortion.

Maybe a thermally activated fan can take care of the large heat loads. If there is one, I hope it is not too noisy.

Paul

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the 1derful1