My dream vintage/retro setup would be a rotel rb-1090 and a denon dvd-5910. Couldn't care less about SINAD with such a setup
The old, black version of RB-1090 (measured in 2020, so it must have been at least 15 years old):
One channel is slightly worse. That's the numbers below:
1W, 8 ohm, 1 kHz, second harmonic: -99 dB
1W, 8 ohm, 1 kHz, third harmonic: -109 dB
300W, 8 ohm, 1 kHz, second harmonic: -91 dB
300W, 8 ohm, 1 kHz, third harmonic: -104 dB
THD+N, 100W, 8 ohm: 0.003% (-90 dB)
THD+N, 100W, 4 ohm: 0.006% (-84 dB)
THD+N before clipping (370W, 8 ohm): 0.0035% (-89 dB)
THD+N before clipping (670W, 4 ohm): 0.007% (-83 dB)
Power at 1% THD+N, 8 ohm: 440W
Power at 1% THD+N, 4 ohm: 770W
THD+N at 15 kHz, 1W, 8 ohm: 0.0075% (-82 dB)
THD+N at 15 kHz, 300W, 8 ohm: 0.009% (-81 dB)