It is most likely a misprint. Quad, to my knowledge, never made a "540F" amplifier. They did make a dual channel 140W amplifier, with provision for a floating front end input, the 520f. I have one and cannot see anything like it in the video.Originally Posted by Macca
I checked the studio's equipment list
Quad also made '240' amplifier for professional use. It only had a small production run of 180 units and is now extremely rare.
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