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Buzz across all channels in crate rfx120

Silent when guitar not plugged in, but when guitar plugged in there is a buzz/hiss consistant across all three channels of the amp

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I also have this issue. Same crate combo amp. There is a loud buzz emitted only when there is a cable plugged in. Cables and instruments checked good, only possible issue is inside the input of the amp. Popped it open, solders and connections were intact and appeared solid. Anyone have a guess as to why this is happening?

Posted on Nov 29, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 120 Answers

SOURCE: Electric Guitar wont play through Amp

the buzzing is indicative of an open ground connection, check the cord by substitution or with an ohm meter, if the cord is good look at the connections to the jack inside the amp ( im guessing you built the amp from a kit). Is this a solid state amplifier? Tube amps have lethal votages and should not be experimented on without knowledge of electronic safety. Also if there is more than one input to the amp try plugging the guitar into another one and see if its still the same.

Posted on Jan 02, 2009

Geekman
  • 32281 Answers

SOURCE: loud buzzing when amp connects to guitar

The buzzing noise could be caused by a grould feedback loop. This occures when the amp is plugged into one power socket and the guitar's amp is plugged into a drifferent power socket.
Try to use a power board, plug in all your devices into this power board and plug the power board into a power socket.

Posted on Jan 03, 2009

danforddan1
  • 192 Answers

SOURCE: amps broken need to fix it

Their may be a schematic on the inside of the amp.I don't remember if Crate puts one or not. And I have had several Crate amps. never needed repair except for tube replacement. If there is not one in side , go here and find what you need . http://www.crateamps.com/support/warranty/ Good luck DFD please rate me TK U

Posted on Apr 19, 2009

soundchasr
  • 8 Answers

SOURCE: NO sound through the AMP even though the power light comes on

Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.

Posted on Jul 25, 2009

  • 5603 Answers

SOURCE: Buzzes and feedback

Make sure the "ground lift" option is used on the direct box.

DO NOT UNDER ANY CIRCUMSTANCES use a headphone output jack as the output of this unit. The headphone jack is for HEADPHONES that have no return to ground. Use of this as drive to a sound board is sure to cause problems and in some cases can fry these amps due to the circuitry.

The cable used to go to the direct box should be very short and high quality.

You should source the power for this unit from the SAME source and receptacle as your sound board if at all possible.

Posted on Nov 08, 2009

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Buzzing noise when not playing


All amplifiers make a little bit of noise (hiss) but it is normally slight and drowned out by playing. However, assuming that this is not normal system hiss, here are a few simple steps to try and locate the source of the problem by process of elimination.
  1. SAFETY FIRST - a common cause of a humming or buzzing sound can be a lack of earth (grounding) on the mains supply. With a 240volt AC supply this hum will be at 50hz (in the UK) - frequency may vary in other countries but should be similar. Check the earth first because of risk of electric shock. Until you are satisfied that this is not the cause of the problem DO NOT touch any metal parts of the amp. Remove the mains lead and try a different one. Try plugging the amp into a different mains outlet socket (preferably one on a completely different circuit).
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My fender hot rod deluxe is buzzing


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Ok so if it's not noisy in another amp, turn on your fender with nothing plugged in. It should be silent? Is it? If not, check to make sure no ones messed with the earth lift switch.
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Is it still noisy?

Well so far, I'm hoping you have been using it all Clean and direct with NO FX Pedals and such like. These thigs can add numerous buzzes and hums to any rig. Again break it down, try each one by one until you get the rid of the buzz.

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Make sure the "ground lift" option is used on the direct box.

DO NOT UNDER ANY CIRCUMSTANCES use a headphone output jack as the output of this unit. The headphone jack is for HEADPHONES that have no return to ground. Use of this as drive to a sound board is sure to cause problems and in some cases can fry these amps due to the circuitry.

The cable used to go to the direct box should be very short and high quality.

You should source the power for this unit from the SAME source and receptacle as your sound board if at all possible.

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