Why is my amp still squealing??

[toejam]

My amp (Mesa/Boogie F-30 1x12 combo) was feeding back/squealing at very low volumes. I changed out the four stock preamp tubes to EH, still had the problem. I just changed out the two stock EL84 tubes to JJs... still having the same problem. It doesn't matter what guitar or what kind of pickups, so I don't know what the deal is. If I use my Boss Noise Suppressor, though, it helps gets rid of the problem. Any clue what it could be? [img]/images/graemlins/help.gif[/img]

[Grandturk]

Re: Why is my amp still squealing??

Do you have anything else in the signal chain? My TS-9 is picking up radio stations now. Also, what about you cables? They could be damaged and adding to the noise. Where is the Boss Noise Suppressor in the signal chain? Pre-amp or effects loop?

[toejam]

Re: Why is my amp still squealing??

I've got a Korg rack tuner in the loop, sometimes a Rocktron Pro-Q also goes in there. It does it either with or without anything being in the loop. All my cables are pretty new and it's not them. The NS2 I use in front of the amp when I feel like using it. I'm stumped. Maybe some other problem inside the amp? It sounds fine playing through it, just when I stop and don't mute the strings it squeals. And at loud volumes, even muting doesn't really help without the Noise Suppressor.

[Dreamland_Rebel]

Re: Why is my amp still squealing??

do you have the TV, computer, flourecent lighting, on or anything that might cause interfearance?

[Ebbflow]

Re: Why is my amp still squealing??

Is there a ground lift on that amp? If not I have used those 3 prong to 2 prong adapters in some situations and that made the noise go away. Probably not the safest thing to do but it worked [img]/images/graemlins/tongue.gif[/img] I'm suprised that changing all those tubes didn't fix it. That sucks I can't stand noisey amps.

[Dreamland_Rebel]

Re: Why is my amp still squealing??

could be the guitar wiring as well.

[toejam]

Re: Why is my amp still squealing??

I could try one of those 2 prong to 3 prong adapters and see. It is in my living room at the moment, but not real close to the tv. When the tv is on, I do notice a little more hum, but nothing major. Last time I had it at my cousin's house, I turned it up to be heard over the drums, and it was pretty squeally! I don't know about the guitar wiring, as it does it for all my 6 of my guitars (3 have EMGs, 1 Duncans, 1 DiMarzio, the other Carvin).

[Cleveland Metal]

Re: Why is my amp still squealing??

Does it squeal when there is no cord in it?

Have you tried different cords?

[toejam]

Re: Why is my amp still squealing??

If I have a cord in it and it's not connected to a guitar, it doesn't squeal. Doesn't squeal without a cord in it either. I have tried different cords... standard Monster Cables, Spectraflex, Fender, Pro-Co. And I don't even have to stand that close to the amp for it to happen. [img]/images/graemlins/scratchhead.gif[/img]

[Chuckracer]

Re: Why is my amp still squealing??

What are your settings?

[horns666]

Re: Why is my amp still squealing??

Joe what is your date of birth and shoe size...it's important..

[jackson1]

Re: Why is my amp still squealing??

This is a tough one. A sound sample might actually help the troubleshooting. Not kidding.

[toejam]

Re: Why is my amp still squealing??

Channel 1 (clean): Gain is at 9:00 o'clock, treble 12:00, mid 11:00, bass 1:00, reverb 12:00, volume 8:00.

Channel 2 (distortion): Gain 3:00, treble 1:00, mid 12:00, bass 11:00, reverb 9:00, volume 7:00.

I only get the squealing on channel 2 and, as you can see, the volume is almost off.. just loud enough for living room volumes.

[toejam]

Re: Why is my amp still squealing??

[ QUOTE ]
This is a tough one. A sound sample might actually help the troubleshooting. Not kidding.

[/ QUOTE ]
Too bad I don't have any recording equipment to make sound samples.

[Chuckracer]

Re: Why is my amp still squealing??

There's gotta be something wrong with that amp.