Question about Yamaha AX-596 Amplifier

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Roland AC90 crackles when using a slide.

I just bought a Roland AC 90 amp to replace my Roland AC100 that is about 30 lbs heavier. I intend to play my acoustic and electric guitars through it; never had any trouble with the AC100. I'm hearing a crackling sound on the AC90 when I use a steel slide on my electric. I never heard that sound on my old amp. Any ideas?

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It is because the AC-90 is not grounded. If you look at the power cable, there is just + and -, no ground/earth. This is because ground is not usually needed when using acoustic guitars/ mikes. If you use an electric guitar, or a slide, there will be problem. I have a AC60, that does go to ground. No hum. AC90=hum. Can probably be fixed by attaching new power cable and soldering earth to the chassis, like on the ac60.

Posted on Mar 20, 2009

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Hi...
Being a guitar/bass player myself and in electronics for 27+ years..I'd take it back and get a new one. Sounds like something electrical isnt doing it's intended function

Posted on Jan 27, 2009

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Without actually hearing the sound, I can't say for sure, but a few possibilities:

1) The input is being overdriven (not likely if only when using slide)
2) There is some DC on the signal cable that is somehow only seen when using the slide. This should be avoided because of capacitor coupling inside the amp, but may be a problem.
3) bad ground in the guitar itself that is only evident when using the slide.

Dan

Posted on Jan 27, 2009

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