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Roland 150 amp makes a buzz sometimes. But cables are fine

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There are spraycans of cleaner that u can buy to cure it. sounds like dirty pots like maybe your volume pot on your amp or the pots on the instruments your playing. get the cleaner ,spray in the pots and move them back and forth and thats it. my marshall amp was doing the same and that was my cure. i dont remember the name of it but phone long and mcquade or another store and ask. hope that helps ya.

Posted on Sep 27, 2019

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Posted on Jan 02, 2017

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You have a ground problem. I suspect your cord. Replace it, being sure you use an instrument cable, and see it that doesn't help.

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Best bet is to contact Roland support directly. Here's the link-
Roland Company Contact Us

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Try different cables. That would be the most simple and cheapest fix.

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This is often caused by poor earth lead connections or pour quality screen cable being used to the inputs of the amp input.

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My amp becomes distorted when I turn my keyboard up. Both the Master Volume and the CH1 volume knobs are in the middle(12 o'clock). How do I keep my amp from distorting?


You left off the one bit of info we need... however, make sure the volume control on the keyboard is around the halfway point... If it is way down, turn it up and reduce the channel volume knob some. Make sure the cable from the keyboard is an instrument rated interconnect and not one intended for speaker (usually marked as such). Make sure the keyboard AND this amp are powered from the SAME receptacle... even if you have to run an extension cord. Listen with headphones on your keyboard to make sure the sound is clean there.

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Hello - I have a Boss RC-2 Loop Station. While I enjoy the pedal's capabilities, it almost always creates an unwanted hum and sometimes an electronic pulse in every amp I use it with. (I typically keep...


Make sure the power supply for this is powered from the SAME receptacle as your amplifier is powered. Keep the cable from this to the amp fairly short and high quality cable. Keep guitar away from magnetic field sources... the wall wart adapters are notorious for generating magnetic fields.

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There is a power, but no sound at all.


When you turn it on does the speaker thump or make a hissing sound? If so then the speakers are ok. If there is notany sound, you must measure the speakers to make sure there is continunity.
If you need further help you can send it to Pro Line Music.215-736-8055

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I have a very loud hiss/buzz sound coming from my Roland. It goes away if I lower the high volume knob. This just starred to happen recently. I tried changing connections from ch1-4 but no fix.


If this ties to a keyboard, make sure the keyboard and this are BOTH plugged into the same receptacle. You should send a higher level from the keyboard (turn volume up to around 70% or so) and use less volume at the input gain of this amp. Use more at master volume if the amp has one if needed. If the hiss is there with NO input cables plugged in and input gains at 50%, that is objectionable, the amp probably needs servicing. Unused channel gains should be clear down.

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1 Answer

I have a roland kc 150 65w amp that begins humming the moment i turn it on. its a normal low frequency hum. nothing is plugged into it, and when i ajust the volume knobs it does not effect the sound. How...


First thing is to determine if sound is from the speaker or possibly the cabinet. If from the cabinet it is likely the power transformer is vibrating the chassis. This sometimes can be cured by adjusting the mounting bolts.
If the sound is from the speaker, then an electronic "cure" is needed. Please note that a very quiet hum is normal but if you can hear it 5 foot away, that is un-normal.

The hum would probably be due to failing component in the power supply. Unles you are adept at electronic repair, best to take it in for servicing.

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1 Answer

My spider III 15 watt buzzes whenever i have a cable plugged in.


MAKE sure you have it connected to a three wire circuit that has the ground. A lot of these style amps will buzz if they are left ungrounded.

Also search for sources of buzzing light light dimmers.

Further, power supply electrolytic filter caps are suspect.

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