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Neve B640 amplifier - IC1 was 5534 / 2N3053 can replace BC441 / 2N4037 can replace BC461
D1 and D2 provide some base spread to output devices to reduce crossover distortion
large open loop gain and feedback of chip reduces it further - active transistor bias
as in B340 and B440 amplifiers would be better but specs on this are okay...