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Post subject: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 12:47 am
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I have now had 3 brand new Super Champ X2 amp heads go into a loud, white noise "melt down" that renders them useless as an amp. It occurs on both channels and whether the effects are switched on or off. The volume control on both channels will turn the noise louder if turned up. You can hear the guitar sound underneath the noise - as if these are two separately processed signals. If I unplug my guitar chord from the input, the noise ceases but if I plug back in the noise resumes. The only way to stop this is to turn the amp off, wait about a minute and turn it back on. The amp does not exhibit this problem each time it's used but after a few uses or an hour or two, the problem re-occurs. One of the amps started making the noise within 2 minutes of being turned on for the very first time. I have called Fender's Support Line and they say that they are unaware of this issue. It has happened on 3 amps (each time, I had AMS or GC replace it and the new one did the same thing) so I find it hard to believe that this is an isolated problem for just me. Has anyone experienced this same issue? (I will try to upload a video later once I get it to my computer). I absolutely love the tones and flexibility of this amp, as well as it's low power, but I am very frustrated that I can't get a working SCX2. (FYI: I am using the amp head into a Bogner Alchemist 2x12, 8 ohm cabinet with Strats or Tele guitars, with or without pedals).


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 4:22 am
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roberteichler wrote:
I If I unplug my guitar chord from the input, the noise ceases but if I plug back in the noise resumes. .



Guitar chord or cord ? :lol:

To me it look it is not the amp . Check you wires , accessories , guitar , if any ground loop ....

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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 5:37 am
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Agreed. Check all your cables, guitar and power. Be sure your outlet has a good ground. Try your guitar and cable on another amp, preferably at a different house. Three failed heads, with the same problem, seems unlikely.


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 7:45 am
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Thanks for the responses but I don't see how it is the gear. I have used different (and all high grade) guitar cords and plugged directly into the amp and/or thru my pedals. If it was a ground loop or bad cable, it would not be intermittent and turning the amp on/off would not solve that problem, as far as I can tell. I have 4 other amps at my home that I use with the exact same equipment and none have the problem. This is very loud white noise and not hum. I tested it by leaving the amp on and a guitar plugged directly in for over an hour. The amp will function properly for a while, then the noise will start. I used one of the earlier ones at a band practice so it was at a completely different location/home and it had the same issues. I'll continue to experiment and follow up on your suggestions but I'm just not seeing that as the answer. (I agree, by the way, that multiple failures suggest something external but not even the Fender support person mentioned that...odd...).


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 8:06 am
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How can you explain the amp is quiet if nothing is plug ?

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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 8:11 am
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stratele52 wrote:
How can you explain the amp is quiet if nothing is plug ?

Muting circuit on the jack?


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat May 30, 2015 8:29 am
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ChrisH1 wrote:
stratele52 wrote:
How can you explain the amp is quiet if nothing is plug ?

Muting circuit on the jack?


Muting circuit ; If you talk about input jacks shorting to ground contact ; if not ok noise is there with nothing plug .

If you plug something in jack ; wire with guitar , you don't use shorting jack muting circuit . You don't need it .

Often a vintage amp is noisy with nothing plug because shorting jack's contact are dirty or broken

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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Fri Jun 05, 2015 11:07 pm
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I discovered the cause of the problem (and a solution) and it IS the amp. Here's the rundown on the problem, cause and how to solve it.

I turns out that it is somehow related to the effects model of the 65 Spring Reverb (that is the default Spring Reverb setting) and only occurred with the amp was in either Channel 1 (the all tube channel) or Channel 2 in the Jazzmaster setting. Why - I can't explain - but I ran through every amp model and effect and completely narrowed it down to these 2 and only with the 65 Spring Reverb or the Delay-Reverb IF the 65 Spring is the reverb model on the setting (and that is the default). But to cause the problem, there is one more factor. You have to push the amp/preamp with a very strong boosted signal into the front of the amp AND have the effects turned on. So if I used my Fulltone OCD, Tube Screamer or Xotic EP (for example), and really hit the amp hard, the white noise would start up. I was able to duplicate and repeat this issue at will and it always occurred with those settings and the pumped up input. It's certainly very reasonable that you might be running a cranked OD into the clean amp - that's what Fender tube amps are all about - so it's clearly a serious flaw in the amp's circuitry.

Here's how to solve the problem: Hook up your amp to the FUSE program and change the reverb to something other than the 65 Spring Reverb. So, I switched the Reverb/Delay patch to a 63 Spring Reverb and I switched the 65 Spring setting to a Large Plate (you can make it anything you want...just NOT the 65 Spring). That worked perfectly. I have not been able to recreate the problem. I prefer the 65 over the 63 for a spring sound, but it's not the end of the world. Hopefully Fender will resolve this issue and I can get that patch back.

I can't really say what it is about the 65 Spring Reverb patch that is the problem. I tried changing some of the parameters and it did not solve the problem and since I resolved it as I've described, I didn't take up any more of my time trying to find what was wrong with the program but it's clear, that's what the problem was.

I'm really surprised that Fender has not seen this or heard about this more. This was the third amp that I tried and it happened on all three. It's just the first one that I was able to run down the problem. I do appreciate the input I received on this but it turns out it is NOT a ground loop, equipment issue or problem with my gear. My hope is that on a future FUSE update, Fender will have fixed this problem.

I hope this helps anyone who has the problem with their Super Champ. I love the amp and now I'm a happy player but it sure took a lot of time, effort and frustration to run down the problem. Feel free to write if you want more info about how I fixed this.


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat Jun 06, 2015 4:42 am
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Very interesting cause. Glad you found it and have such an easy fix!


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Mon Jan 23, 2017 3:28 pm
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I'm just happy that roberteichler took the time to troubleshoot an issue, and actually COME BACK to let others know the "fix".
Seems there are a lot of one post wonder's, that come around asking questions...get some answers...and never come back to let anyone else know the out-come (good or bad).

Now; if Fender and/or Fuse software hasn't made any changes to the 65' Spring Reverb, atleast other readers/members (like me) have something to search for and actually use. Thank you much roberteichler!

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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Mon Nov 27, 2017 8:44 pm
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Apparently not fixed by Fender. Just bought a new X2 head (1 month old) and had the same thing happen. Used the above fix and it worked. I contacted Fender. We'll see if they can fix it with a firmware update. Thanks!


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Sat Sep 08, 2018 10:20 am
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There's a 65 Spring Reverb on the amp somewhere?


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Tue Jan 01, 2019 12:52 am
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I know this topic is about 4 months old but this is related and important.

When I first got my SCX2 I came here complaining how noisy it was at the time. I was so annoyed I called Fender Support in Arizona. They assured me that the amp is quiet, so I looked for external causes.

With a $10 Klein outlet tester from Home Depot, I checked the circuits and discovered only the bathroom and kitchen outlets had the earth grounds connected. That's because this old building had only 2-prong outlets when it was built in 1959.

Sure enough, the amp is quiet when powered from a property grounded outlet, such as a bathroom or kitchen outlet.

First thing I do at a gig is check the outlets before plugging anything in.


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Post subject: Re: Loud White Noise on New Super Champ X2
Posted: Fri Aug 23, 2019 8:29 am
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Thanks for posting this. I discovered the same issue with the 65 spring reverb. Thought it was something wrong with the amp more broadly, but was able to choose another reverb to eliminate the issue for now. However, I would love to be able to use the 65 reverb soon...


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