so [ElectroBoy]’s dual voltage PSU board for audio amplifiers is worth a second look. This type of linear power supply has an extremely simple circuit consisting of a transformer, bridge ...

Perhaps understandably with such an old device, after cleaning away the dust of ages he replaced the power supply circuitry with new parts and PCBs. A linear amplifier is surprisingly simple ...

The three new products are the MODEL 10 Reference Integrated Amplifier ... powered by a separate linear power supply. Distortion is just 0.05% THD across the entire audio band at full power ...