Remembering so may years ago listing to this amplifier, very nice sound. It was possibly with turntable, moving cool cartridge with tiny Ortofon (RCA adaptor) step up MC transformers.
Schematic can be found here:
musical fidelity A1 schematic Google search images
Design by Tim de Paravicini:
https://en.m.wikipedia.org/wiki/Tim_de_Paravicini
BD135 driving 2N3055, BD136 driving MJ2935 at the output stage operating in class A (electrons flowing all the time).
more information on Musical Fidelity A1
https://www.markhennessy.co.uk/mf_a1/technical.htm
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