How Hot is Too Hot - Diablo 300 - Hell Hath Some Fury…!

Check with the manufacturer or dealer.

Am also in South Florida and run hot gear (First Watt M2 and tube monoblocks), but with a constant 72 degrees. I have found that low 70s vs high 70s makes a big difference in amp temps and would give Gryphon a call. You don't want to burn that puppy up.

If its solid state and you can’t put your hand on it that’s too hot.

jomonhifi

Nelson Pass says 5-6 sec for the palms on the heatsinks is perfect amount of Class-A bias, for the size of the heatsinks, means the heatsink are around 55c after 1hr at normal room temp.
That was his response to me with an email when I was biasing from memory a Threshold Statis 500 or something he designed as the emitter resistors at the bottom were impossible to measure safely so I could only go with heatsink temp.

Cheers George

I’ll bring the FW J2 into the main system once we get into cooler weather.  I do agree there is a big difference in heat from an amp low 70’s to upper 70’s.  

Yes that is normal and fine. Same thing happened with my Clayton Audio class A amp. Could not keep my hand on her for more than a few seconds.

A 300wpc A/B amp is going to put out some heat. It's got big heat sinks for a reason.