I bought a 3020A more than 20 years ago to drive external speakers with my TV.  With the right speakers (many options I'm sure) it can still offer surprisingly musical performance.  Mine is stock other than replacing the speaker spring clips with miniature 5-way binding posts.
I had two of them back in ’78 - ’79. Cost $219 each. Used them as mono amps (one channel per speaker) with a pair of Time Windows. Sold them (and the TW’s) when I bought Quads and a Bedini 25/25 (and a little later, a Futterman OTL). But the two 3020’s driving the TW’s single-channel sure sounded good!
Great sounding cheap amps (made in Taiwan)! And if you like the NAD's, don't over look the Proton gear (same designers, same Taiwanese factory)!
Lest we forget, The Audio Critic gave it top billing on the front cover: "Sounds better than many $2000 separates". After reading that, I just had to have one! In fact, I bought two! They sounded as good as Peter Aczel claimed!
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