Were vastly overpriced and offered little if any audible improvement on this JVC. But the service manual and cct diagram is. It is truly massive, and here's some of the secret of the solid sound. The bass falls off rather too soon, which may have more to do with ageing capacitors in the signal path than anything inherent in the design. Square waves remain remarkably unaffected by being passed though this amplifier, with no visible ring shown on my HP oscilloscopes. Later, on test, I adjusted the mysterious chip that sets up the current that defines where class A becomes class A/B. Into two Clements TL 'Spatial Image' floor standing speakers, it almost matched my own 40 year old 20 wpc class A amp, inspired by my dear departed old friend, John Linsley Hood, but with slit supplies and two constant current sources defining the standing current, and no bootstrap capacitor Give me a week with any amp and my ears tell me nearly all I need to know about its qualities and vices. I was then astonishingly impressed by the sound. Two quick sqirts of switch cleaner on the volume control pot and a bit of diamond filing of the complex & rusty cassette tape record/play switching mechanism put right the faulty channel and made changing the volume sound less like sandpapering the midrange speakers. Reviewed Nov 27th, 2016 by I have always designed and built my own class A amplifiers, but seeing this old amp on eBay I thought I'd make a bid for it, and I won the auction for less than £10.
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