Threshold Stasis S/150

^Caps can last a few decades. Some of these amps can be 42 years old. 

FYI, the Threshold S series amps (perhaps a bit generously) were rated as outputting the first 20% of their 8 Ohm output into 8 Ohms per channel as Class A. The Class A output would halve as impedance halved, while the Class AB output would simultaneously nearly double as impedance halved.

@unsound Probably is but at a reasonable level, it shouldnt be a problem. With my room treated with basic reflective points, it made a big difference.