I have and use an RX-Z9 RECEIVER bought new for $4,050 in 2003, the first year they had a 10% off sale.
This unit now has over 35,000 hours on it and still functions as new! I’ve actually worn out the first remote.
The unit operates in Class A/B and can peak at 540 WPC. (Must be heavily into Class A because it gets real hot when there is no/little signal.)
For music (Oppo-95 ) I run it in "Pure Direct" mode which by-passes everything but the volume control and turns off the digital circuitry. I’ve run it with an open load all the way to a dead short and never has it failed.