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Heat issue with Lamm M1.2 Reference

I'm having a heat issue with one of my Lamm M1.2 Reference mono blocks or rather a lack of heat.

One of them is suddenly putting out less heat than previously, especially at the rear of the amplifier, where it is almost cold to the touch even after 3 hours of playing.

Neither my wife nor I noticed any difference in the sound tonight, but we were playing soft music all evening so nothing to really challenge the amps.

Anyone experienced anything like this before? Any thoughts on the cause?

Thanks,

Ed
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Showing 1 response by aball

aball
2,016 posts
 
Something wrong happened for sure. It could be that half the tube went bad - I've had some tubes test bad but their sound was still good. Not sure how that happens but I have experienced it twice. You could replace the tube and see what happens. While you are at it, check for fuses on the main board. If after that it still doesn't work normally, it's time to call Lamm.

Arthur
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