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Post subject: Super Champ xd dsp problem (apparently tube problem)
Posted: Fri Oct 24, 2008 10:48 am
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Hello music friends.
I'm the happy owner of Super champ xd amplifier.
That amp sounds absolutely great!!!

The problem is in the dsp. I can hear a nervous bass tones in the background when I play specific tones or chords... This is annoying and this error prevents me to use this amp for professional recording purposes.
I hope there is some kind of a solution for this problem, cause I'm searching the Tone for a long time and Super Champ xd is very very close...

I'm playing mostly on voice one, gain 8, vol 2, I get fantastic sound with my Texas special pickups on bridge + middle position.

Please help. Nice regards, Tilen Pusar


Last edited by s52ow on Sun Nov 02, 2008 3:25 pm, edited 1 time in total.

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Posted: Sun Oct 26, 2008 10:04 am
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Might be the dsp trying to "interpret" the decay. Try turning up the amp master volume to 8, or even 10. If too much gain there, then turn gain down to maybe 5. And regulate the overall volume with the knob on the guitar.


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Posted: Sun Oct 26, 2008 12:02 pm
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I tried to duplicate it on my SuperChamp and could not. But I do not have the same pickups. Sorry I could not help.

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Posted: Sun Oct 26, 2008 12:38 pm
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Hello.
If you play F on G string (it must be tuned) you will here the problem.
If I try with different settings I ruin the sound I want, but again it happens also
on other sound settings. I hope there is some kind of a hardware solution to this problem?!

Nice regards, Tilen


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Posted: Tue Oct 28, 2008 3:43 pm
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The same problem happens when I Play with my Gibson sg guitar.
I can hardly believe that nobody else is notesing the "phantom" tones.


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Posted: Tue Oct 28, 2008 4:47 pm
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I cannot duplicate it either with my Strat/SCXD. Maybe it's tube rattle. Make certain that the tubes are seated well. Otherwise, I am out. Hope you can solve it.


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Posted: Wed Oct 29, 2008 1:24 pm
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I'm afraid that the problem is in dsp, that a shame.
I realy like the sound of that amp.
A new design of the dsp unit would probably solve the problem.


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Posted: Fri Oct 31, 2008 7:51 am
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Hi,

I´ve tried to reproduce your problem and was really surprised: the same problem and I haven´t noticed it so far!

In May I had to return a brand-new one, because it burnt out when I turned it on the first time! Well, the second one came really quick and I had no problems until now. And I was really happy about it because of the experiences with the first one. However, I haven´t played with the amp for some weeks now.

I have recorded the unusual background sound when playing the F note with a Shure microphone. You may download the mp3-file here:
http://www.nachtschlacht.com/test/Fender_SCXD.mp3

I start with the notes: E on G-string (fret 9), F, F# and G. Then chord E (D-,G-,B-string together on fret 9) and chord F (like chord E but on fret 10).
Turn your volume up and you may hear a hiss or rustle noise when I play the F on G-string (fret 10) and F# (fret 11). It´s like a jet flying by in the far distance!

I don´t know how to solve the problem either. I have tried every voices, with and without effects, channel 1 and 2. Every time I hit the F, you can hear this strange background sound.
What do you think about it? Should we return the amp? Is the dsp broken? Maybe there´s someone from Fender here who can help?

Ah, forgot to tell that I have a Fender Strat with Texas Specials. But I´m gonna try another guitar with other pickups. Let´s see what the F will do...

Chris


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Posted: Fri Oct 31, 2008 3:53 pm
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Hello Chris!
I'm glad that you confirmed the same problem with your amp.
The same problem also with humbuckers (Gibson sg).
I think the dsp has an error.

I realy hope that Fender will solve the problem, maybe a new dsp??

Nice regards, Tilen


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Posted: Sat Nov 01, 2008 9:32 am
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I find a new interesting thing. I also recorded the samples.

The signal from Line out jack is clear, all ok
Hear the sample: http://s52ow.heliopolis.si/audio/XDlineoutChamp.mp3

The signal from speaker, recorded via Mike has bad errors. (I tried two speakers so the speaker is ok.)
Hear the sample: http://s52ow.heliopolis.si/audio/XDMikeChamp.mp3

So, the signal from Line out is ok, that probably means that the dsp unit is ok,
the error occurs lately on the path towards the tubes, so maybe there is something wrong with preamp or output tubes. I don't have the knowledge to know. Any thoughts?

Nice regards, Tilen


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Posted: Sat Nov 01, 2008 11:46 am
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Hi Tilen,
yes, I´ve also tested my Fender today for a while and came to the same conclusion: there must be something wrong with the tubes. I still have the original ones, but some spare ones from TAD are lying around here. Will try them once I have the time and guts to change the tubes, ;-)
Because I do not know anything about tubes etc. either!
However, it is strange that the tubes already get broken after such a short time. I bought the Fender in summer this year and haven´t played much with it so far.
Well, at last I am glad that the dsp seems to be ok.
Have a nice weekend.
Chris


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Posted: Sun Nov 02, 2008 11:57 am
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Hi Tilen,

so I have changed the tubes and the strange background sound is gone!
There were a pair of 6V6GT (6V6EH) electro harmonix made in Russia 0804 and a "Fender" 12AX7 in my SCXD (I couldn´t see any damages to the tubes).
I easily changed them against a matched pair of heavy duty 6V6GTB-STR from Tube Amp Doctor (RT232) and one 7025 Highgrade ECC83 (RT010).
Now, everything is ok again.

Chris


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Posted: Sun Nov 02, 2008 2:07 pm
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GOOD news, Chris!
Congratulations!
Did you find out which tube was bad? Maybe 12ax7?
I'll do the same. I'll replace the tubes. I'm thinking now which tubes will produce the best sound?
Rich, Full, Bright etc, maybe JJ?

Thank you very much! Tilen


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Posted: Sun Nov 02, 2008 5:40 pm
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So......two days after I post that I could not hear these low frequencies you talk about (but I can definitely hear them in you mp3's), I am heading out for a backyard gig. Plug in the Strat for a sound check, and the sound is great, for about 30 seconds. Then fades to nothingness. I noticed that the 12AX7 pre-amp tube is sitting kind of off kilter. I press in to place. The sound comes back......for about 30 seconds. Then goes completely silent again. And nothing brings it back.

All of the tubes were glowing, even the 12AX7. The fuse looks good. I put an old 12AX7 from another amp, that was working, in place of the Fender tube. It worked (though the tube is old and the sound stinks).

I think the problem is that Fender 12AX7 pre-amp tube. It must be a lemon. (My amp is 7 months old, and I do not play it but 2-3 times a week in my bedroom).


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Posted: Mon Nov 03, 2008 7:31 am
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Hi,

@Tilen: I haven´t checked the old tubes e.g. with an electrical tube check. All three were glowing and I couldn´t make out any damage after pulling them out. There was no break, no black soot or something else. Also, I think they were pretty well into their sockets. As I had three new tubes lying around I didn´t dare to check them one against one, but rather change them all at one time.
Concerning the "right" tubes: Well, I have no idea. When I was searching for suitable tubes some weeks ago (obviously in a mood of premonition), I came across the mentioned ones from Tube Amp Doctor. I´ve read a lot of things about tubes on the internet and thought these ones would fit for me (RT010: Great for warm clean tones and creamy overdrive. RT232: Sweet tone with silky highs). Well, they are ok and the sound is much clearer or more defined now. Not so muddy like with the old tubes (including with the "slightly" damaged one).

@WhatsThatSmell: Sorry to hear. So, we can say that the 12AX7 was broken or slightly damaged...

Well, it is amazing that only we three had that problem. But maybe others will read this thread on day the problem occurs to them and have some help then.

Best wishes to all of you,

Chris


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