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Gamut M250 MK3

I got a pair of Gamut M250 Mk3 mono-blocks that went in place of a D200 mk3. They were installed yesterday, and worked fine for a day. This morning I turned on the amps to warm up. A bit later I went back to the listening room and heard a very loud hum. First I looked out the window for a garbage truck; then put my ears against the speakers. Nothing there. It was coming from the amps. Power-cycle of both amps confirmed that both were making that noise, though one was louder than the other. About 10 minutes later the noise was gone. I have a feeling that this might be one of those intermittent problems that's difficult to track down, but I do want to get to the bottom of it while they're in warranty. To other owners of the M250, have you ever experience such a problem?
ping2357
psjulian
99 posts
 
Send them back while still under warranty. I'm using a DI-150 integrated and have NO hum unless you put your ear on the amp and then it's just a typical transformer sound.
ping2357 OP
10 posts
 
I hate to send them back, but I may have to do that. When I was listening to the cello suite late last night, in between the notes I could hear the transformer hum. My listening position was 12+' away. Sound meter on top of the mono-block chassis measured 55db. On top of other components, it measured nothing(<50db). I turned off the system in disgust.
ping2357 OP
10 posts
 
Psjulian, Thanks for the confirmation. I hooked up the D200 again and it had no hum unless I put my ear on the amp.
psjulian
99 posts
 
Good Luck!
samtse
49 posts
 
i used Gamut M250 mklll about two years,every day 4to6hours.nothing happen like that,so i suggest send back the amp to dealer.
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