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MXR-130 buzzing sound

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cring08

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TFM-35

Posts: 489

Joined: Fri Jul 30, 2010 7:50 am

Location: Cincinnati,OH

Post Sun Jul 21, 2013 7:01 pm

MXR-130 buzzing sound

My mxr130 is in the basement where i have the gym set up.

We bought a new treadmill, and when its on, the mxr has a loud vibration and buzz from the rear left corner.

Any ideas?
Chris

Living Room/main System:
Sunfire TGP IV
Sunfire 300x2
Carver Amazing Silvers
Apple tv
Carver SD 390t
Technics SL 1950 Turntable

Basement/system 2:
Carver MXR-130
Teac reel to reel
Musical Fidelity X-10D tube buffer
BBE 362 Sonic Maximizer
Nikko eq2
Cerwin Vega HED's
Klipsch SW15
Infinity RS10's
Pioneer 100 disk changer

Garage system:
Pioneer VSX something?
Polk Audio 2500
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jjptkd

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SILVER-7 TUBE AMP

Posts: 2897

Joined: Wed Sep 22, 2010 4:50 pm

Location: Snohomish, WA

Post Sun Jul 21, 2013 7:20 pm

Re: MXR-130 buzzing sound

Try a different outlet? :-k
Sunfire TGP-III
Sunfire 405x5
PS Audio DL-III DAC
Klipsch Chorus II's
Klipsch RSW 15
Klipsch KW-120 (2)
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radioeng2

User avatar

SILVER-7t

Posts: 1350

Joined: Fri Jan 26, 2007 7:06 pm

Location: E TN

Post Sun Jul 21, 2013 9:05 pm

Re: MXR-130 buzzing sound

Treadmills in use are a heavy electrical load. Your steps can actually modulate the power such that you can sometimes see the footsteps in lights. Put on analog voltmeter on that circuit and you'd likely see it dragging the line down a shocking (pun intended) amount every step. They use switch mode supplies that impress a ton of trash on the power line too.

Your hearing an indication of this. I'd suggest for the health of the unit that you want to change something pronto.

It might be advisable to check the tightness of the screws on the outlet and any others in the circuit that daisy chain to the one used for the treadmill. And then the breaker at the panel should also be checked.

The noise in the transformer is indicating that the impedance there is not very low or it wouldn't be possible to impess that much noise on the line and then over into the amps transformer windings.

Mark
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cring08

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TFM-35

Posts: 489

Joined: Fri Jul 30, 2010 7:50 am

Location: Cincinnati,OH

Post Mon Jul 22, 2013 11:11 am

Re: MXR-130 buzzing sound

It's on a seperate outlet, but probably the same fuse.

I'll see if I can seperate them, and check everything you guys suggested.

Thanks!
Chris

Living Room/main System:
Sunfire TGP IV
Sunfire 300x2
Carver Amazing Silvers
Apple tv
Carver SD 390t
Technics SL 1950 Turntable

Basement/system 2:
Carver MXR-130
Teac reel to reel
Musical Fidelity X-10D tube buffer
BBE 362 Sonic Maximizer
Nikko eq2
Cerwin Vega HED's
Klipsch SW15
Infinity RS10's
Pioneer 100 disk changer

Garage system:
Pioneer VSX something?
Polk Audio 2500

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