Generally, Class A amps run extremely hot. That's the nature of pure Class A topology.
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Wilhoover, congrats on getting the HAP-Z1ES. Apologies for being off topic here, but if you have any user review type observations about the Sony that you'd be willing to share, I and several others would be interested. There's another thread named "Sony HAP-Z1ES Hi-Res Music Player RMAF 2013." Check it out!
How hot does the Vincent SV-800 get? Does it get so hot to the point of when you touch it you have to move your hand away immediately? Class A amps get hot but you should be able to touch them for a couple of moments. I believe the legendary Aleph 5 amp gets to 120 to 130 degrees
Fahrenheit (50 to 55 degrees Celsius) in about an hour.