Sorry for the flurry of pro-NAD posts. This is the last one, I promise.

It has come up on the forum before: what is the difference between the original 3020 and subsequent versions.

I knew I'd read it somewhere, but forgot where, but now I've found it. Have a read of this magazine.

"Peter Tribeman delights in revealing what he calls the
'Benign Error', which played a large role in the 3020’s allure. Strangely enough, it was a mistake in the layout of the original circuit board... the 'Benign Error' produced unintended “L-R crosstalk,” which somehow generated more low-level detail and ambience. [It] was eliminated in the second-generation 3020A model, and with it, some of the original’s appeal."