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Help diagnose problem with my amp

I have been using a Myryad SS integrated amp (MI-120, 60 watts/channel) in my system with ProAc D15's for a few years now. I have been plugging the amp into an Ensemble Isolink then to the wall. Last week, the volume has dropped by a quarter of the dial! I checked all connections etc. and nothing appears amiss. It's not just one speaker, both speakers now play at a far softer volume at 9 o'clock on the dial, which previously was plenty loud and detailed. I now have to turn the volume up to 12 o'clock for acceptable listening levels of depth, body and detail. This morning I wondered if somehow the Isolink had begun muting the amp's current, so I unplugged the amp from it and ran the power cord straight to the wall but no change. Any ideas?
sc53
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uru975
684 posts
 
With a tube amp I would assume a tube had blown with ss losing a transistor or resistor network is less likely but possible, how old is it, is it kept on continuously, can you get a measurement on the output voltage to check this?
Just some random thoughts
plato
1,543 posts
 
Did you change your speakers?
sc53 OP
718 posts
 
No I didn't change my speakers! Yes I wondered if a resistor or transistor had blown, but one that affects both channels. The amp is 10-15 yrs old I think, not sure, bought used.
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