A forum member asked if the Sunfire amp has any startup noise. Figured to respond here as well.
It's always had a 'bump' when turning on and a smaller one when turning off. After a few seconds of turning off it gives a small chirp. Attached is a decent sound clip. You'll have to turn up your volume. The recorder is close to the amp, and you can even hear the slight hum of the amp itself. After the 'chirp', the amp is truly off with the power having left the caps.
This amp has been used in our living room HT (RF-7s, RC-7, RS-52s) for about nine years without any issue. I sent it in to Flannery's for a sprucing up only because its 20+ years old. Future proofing is a good thing.
Sunfire Cinema Grand On - Off.mp3