Clearing out some old 1980's hifi and classic car magazines over the weekend, I found a copy of the HiFi News & Record Review magazine which first brought my attention to the demunitive Cyrus 2.
It was a paragraph about the new breed of integrateds that basically dispense with the traditional pre-amp stage (other than the phono stage obv) and build the whole thing round a high-gain power amp linked to the RCA inputs via a source selector and a volume pot, nothing inbetween. Consequently the signal path is about as straight and pure as can be feasibly managed. That's sort of common now, seeing as digital sources mostly fire out 2V+ so you don't need a pre-amplifier, but back then, when line-level meant 400mV tape decks and tuners, it was virtually a paradigm shift.
Cyrus 2 was commended as a notable example of the breed, apparently it being so good that legendary reviewer Ken Kessler kept a 'couple in his drawer' as spares in case his £10k mono-blocs gave up.