How hot should a McCormack DNA-225 get?


I recently picked up a 6 year old one that was just factory checked. The heat sinks get pretty hot with no signal, and with music at moderate levels (feeding Infinity 8 Kappas, nominally 6 ohms) for half an hour, get almost too hot to touch! I'll call the factory and ask, but thought a voice of user experience could be more "honest." It is on a bottom shelf of a cabinet with open front and large openings in the back. At the time nothing was above it (over 2 feet of air.) The DNA-225 is replacing my 20 year old Adcom GFA-555 which would only get "hot" after a good while of cranking out some tunes.

Also, in a different room, the amp is tripping a 15-amp circuit breaker at turn on. Nothing else is on at the time. The original location may have been on a 20-amp circuit, I'll have to check.

Both these things make me wonder if the factory missed something. Ticket said they just biased some transistors. Any owner expeiences would be greatly appreciated.

Thanks,

Mike
kartracer
when it's on for a while and not playing I registered 117 at heat sinks and about 95 or so on the faceplate. When I played music for an hours or so, the heatsinks get to about 128-130. Get a digital temperature reader and take measurment. i know the heatsinks are hot to the touch, but in reality, the temperature is not that hot....bit it feels hotter. Don't be alarmed. If it is much hotter than what I mentioned above, then be concerned.
Regarding this breaker; you can usually detect a weak spring in this breaker.---Turn it off and on---Then try and compare a different 15a breaker. You should be able to feel if they are equal or different in resistance.
All, thanks for your replies (especially Steve.) I replaced the breaker and that solved the tripping problem. I had time to have the system on for about 45 minutes last night and the amp seemed cooler (relative term) also. I have an infrared thermometer, so I'll take some readings, but based on your responses, feel confident the only thing cooking will be some hot tunes.

MikeB.
Why not? Because they add cost and complexity, and I did not feel it was necessary in the DNA-225. Larger amplifiers like the DNA-500 are a different story, and it definitely must have a soft start circuit.

Best regards,

Steve McCormack