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Hello, Not sure if I've posted this in the right forum possibly should be in the DIY section. I recently bought a second hand Rotel RA-12 to use as a pre-amp. The Rotel randomly relay clicks and drops sound for a split second which seems to become more and more frequent over a couple of hours of use. I am guessing it is heat related. It is also gets quite hot towards the back right of the amp. I removed the monoblocks I was using and used the Rotel as an integrated thinking maybe it doesn't like having no load even though the speaker switch is off. And that seemed to reduce the clicking considerably but then I didn't use it for as long so who knows. I have taken the lid off after letting it run for quite a while with no speakers connected and found 2 transistor heat sinks (Q905, 906) under the location where it was getting quite hot. The heat sinks are untouchable for more than a second, they're that hot. Is this irregularly hot? Does anyone know what would cause this? Thanks for any help.