2. amps-preamps
  3. 1223066652

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
nico_g
35 posts
 
I like the GamuT a lot, but, you know, Pass is very good too : I talk about the Call A models like the XA100.5.
I'm sure that the Class AB designs like the X350.5 aren't as good with easy to drive speakers like mine.
The Tannoy GRF are 95db/W/m with 15" woofers and around 8 Ohms impedance.
samtse
49 posts
 
Hi Ping,i also using tube pre(aesthetix) with my GamuT amp.which tube pre are using now?
nico_g
35 posts
 
Hello,
my GamuT D200 is directly connected to my dCS Elgar Plus, no preamp for me.
ping2357 OP
10 posts
 
Samtse, I am using First Sound Presence Deluxe 4.0 Mk II. I am hoping to upgrade their higher end 3 box preamp.
ckoffend
684 posts
 
Back to the OP Question about the hum. I once had a large amp, big transformer, large caps, etc. . . That's a lot of reserve to energize. I know this Q is old.

But I would occassionally run into a similar problem, turns out during the hottest summer days. Called the amp mfg. thinking it was a cap or transformer. Discussed several times and eventually concluded it was a combination of a lack of power supply in my house and the very hot and humid summer days - causing everybody in town to run their ACs. Lot's of draw which seemed to result in the power reserves having a tough time staying or getting fully charged up.

Power usage in neighborhoods is up in the mornings - curling irons, coffee pots, hot water heaters, hair dryers - all energy consuming devices. Perhaps a correlation?
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