Here are some of my favorites from that vintage:
One we all know: NAD 3020 and its receiver counterpart 7020. Actually I prefer the latter - sounds the same, looks way better (in a Technics kind of way, but still), and has a decent tuner. 30+ years later it still puts many pricey amps to shame. Marty Borish, NAD founder, called it his favorite NAD product. I have the nicer champagne version. 1979 (NAD 3020) and 1980 (NAD 7020)
The opposite of NAD 7020: powerful, big, heavy, stylish DENON GR-535. Now this thing is one of the best looking and best sounding receivers. It has a bigger brother, GR-555. 1978-79
And back to England. This is the first amp built by A&r Cambridge, today known under the name Arcam. One of the best looking English amps ever built, and a damn good sounding one. Beats NAD 3020 every time

1976-early 1980s
Philips was making some really cool gear at the time as well. Their Sound Project series was great, big, fairly powerful amps and receivers sold under several brands (Philips, Dux, Loewe, Erres, Schneider, Aristona, the list goes on). Made ~ 1979 by Philips Nihon,Japan. Good sounding stuff, and especially the ones with Exotic brands can be had for cheap. Here's an example, Erres A-8000:
And now the thing that convinced me that Philips was a brand worth looking into: 1979 mini separates 22AH109/209/309. The specs are unbelievably good, and these things actually sound as good as they look on paper. If the Sound Project amps are punchy beasts with cool sound, this is hi-fi for purists. These were also made in Japan. I use 209 preamp with two 309 power amps as monoblocks in my main system, soon to add more cables to use the now idle channels on the power amps for bi-amping.
Cheers,
Raf