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Post subject: SCXD woes
Posted: Sun Mar 01, 2009 7:36 pm
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Well, I just bought a Super Champ XD last Thursday, and I've been playing it a lot lately. The thing sounds awesome! I can get any sound out of it.

Anyways, this morning I turned it on and it buzzes whenever I play an E. It's really apparent on the D and G strings. I was wondering: does anyone know why it's doing this?

On another forum someone commented that it could be a problem with the DSP and I should probably exchange it...


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Posted: Tue Mar 03, 2009 4:59 pm
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Speaker nuts loose?

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Posted: Tue Mar 03, 2009 7:05 pm
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Had a buzz in mine too. It was both of those thin boards screwed in the back with 4 screws (especially the upper one with the tube guard). Put a strip of thin padding (I think it was some type of car stripping) between the main unit and the boards, and screwed them back down. Also tightened the four screws holding the metal tube guard on the upper. No problems since. Also be certain that the tubes themselves are fully seated.


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Post subject: Re: SCXD woes
Posted: Wed Mar 11, 2009 9:52 pm
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FloyDZeD wrote:
Well, I just bought a Super Champ XD last Thursday, and I've been playing it a lot lately. The thing sounds awesome! I can get any sound out of it.

Anyways, this morning I turned it on and it buzzes whenever I play an E. It's really apparent on the D and G strings. I was wondering: does anyone know why it's doing this?


I had the same problem and it`s not the DSP section - it´s the power tubes!

I swapped the EH 6V6 pair with beefier Tung-Sol 6V6GT tubes. That did the trick.

I know of at least two users who did the same to their amp - problem solved.


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Post subject: Re: SCXD woes
Posted: Thu Mar 12, 2009 7:41 am
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Hiwhat wrote:
FloyDZeD wrote:
Well, I just bought a Super Champ XD last Thursday, and I've been playing it a lot lately. The thing sounds awesome! I can get any sound out of it.

Anyways, this morning I turned it on and it buzzes whenever I play an E. It's really apparent on the D and G strings. I was wondering: does anyone know why it's doing this?


I had the same problem and it`s not the DSP section - it´s the power tubes!

I swapped the EH 6V6 pair with beefier Tung-Sol 6V6GT tubes. That did the trick.

I know of at least two users who did the same to their amp - problem solved.
Did you have to rebias the amp with the new tubes?


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Post subject: Re: SCXD woes
Posted: Thu Mar 12, 2009 11:28 am
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I did not rebias. The amp comes rather "cold" from the factory - you can throw in any 6V6 without doing any harm. It sounds just as good as before - only without that dreadful noise.

:D

If you don`t have any problems - keep the stock tubes! They`re good when they work.


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Posted: Thu Mar 12, 2009 12:09 pm
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Mine has been good so far(6 months) but for future reference that is good to know.
Thanks. 8)


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Posted: Fri Mar 13, 2009 12:12 am
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I had the problem too (still do) when I first got my SCXD and was thinking about returning the amp just because of it. Then by chance I came across a Fender 412 cab on Craigslist for $125 and figured I'd give it a try and now I don't have to worry about it anymore- the buzz is gone!

Or at least I can't hear it anymore.

Let's just say it doesn't bother me anymore and now that I've heard the amp with an extension cab there's no way it's going back! I'm playing all the time again and I'm starting to get good again. I actually had forgotten what it was like to play the guitar on a good amp. I can't wait to get a full size tube amp again, but for now this is very close to it with an extension cab.

The other day I unplugged the cab and plugged the amp speaker back in and at first it seemed like the buzz was gone, but after playing for a while I realized that I was able to hear the buzz better on the cleaner channels since I've tightened everything down.

I can really hear it on the low E and A string especially whenever I vibrato on the A string around the 5th and 7th frets it hits the right pitch and buzzes for about a second or two and then goes away again. It's very frustrating to play on an amp that sounds this good and then you hear this annoying buzz on the bass notes.

Needless to say I plugged the cab back in and all is well. I know a lot of people like to mod to the Ragin Cajun speaker and that's really cool, but I don't know if that will solve the buzz problem because I'm not sure that the buzz is always from the speaker itself- it may resonate to some other place on the amp. And if it's the power tubes I guess I'll know for sure the 1st time I change them. So if the powere tubes don't do the trick for you then maybe it's worth it to check out your amp through a nice 8 ohm cab and see what you think- it gets the job done for me.

After a power tube change I'll plug back into my amp speaker and see if the buzz is gone- I actually think the amp several different types of buzz.

Thanks. . .


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Posted: Fri Mar 13, 2009 12:24 am
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Posting error


Last edited by SRVWANNAB on Sat Mar 14, 2009 1:31 am, edited 2 times in total.

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Post subject:
Posted: Fri Mar 13, 2009 7:27 pm
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SRVWANNAB wrote:
I had the problem too (still do) when I first got my SCXD and was thinking about returning the amp just because of it. Then by chance I came across a Fender 412 cab on Craigslist for $125 and figured I'd give it a try and now I don't have to worry about it anymore- the buzz is gone!

Or at least I can't hear it anymore.

Let's just say it doesn't bother me anymore and now that I've heard the amp with an extension cab there's no way it's going back! I'm playing all the time again and I'm starting to get good again. I actually had forgotten what it was like to play the guitar on a good amp. I can't wait to get a full size tube amp again, but for now this is very close to it with an extension cab.

The other day I unplugged the cab and plugged the amp speaker back in and at first it seemed like the buzz was gone, but after playing for a while I realized that I was able to hear the buzz better on the cleaner channels since I've tightened everything down.

I can really hear it on the low E and A string especially whenever I vibrato on the A string around the 5th and 7th frets it hits the right pitch and buzzes for about a second or two and then goes away again. It's very frustrating to play on an amp that sounds this good and then you hear this annoying buzz on the bass notes.

Needless to say I plugged the cab back in and all is well. I know a lot of people like to mod to the Ragin Cajun speaker and that's really cool, but I don't know if that will solve the buzz problem because I'm not sure that the buzz is always from the speaker itself- it may resonate to some other place on the amp. And if it's the power tubes I guess I'll know for sure the 1st time I change them. So if the powere tubes don't do the trick for you then maybe it's worth it to check out your amp through a nice 8 ohm cab and see what you think- it gets the job done for me.

After a power tube change I'll plug back into my amp speaker and see if the buzz is gone- I actually think the amp several different types of buzz.

Thanks. . .


You are going to thank me (in the morning). Get a phillips head screwdriver and remove the 8 screws that hold those two thin boards on the back of the amp. Remove. Play. I bet that the buzz is gone. If not, well I tried. BTW, what is that cab model number so I can search for one too. :wink:


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Posted: Sat Mar 14, 2009 2:58 pm
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I want to put some Tung-Sol 6V6GT's but I don't know what I need in terms of soft, medium, or Hard duet. I had never heard this term until today, and I have been playing for more than 35 years. Love my SCXD! Just bought it last weekend.
Thanks,
Ralphmoe


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Posted: Sat Mar 14, 2009 4:47 pm
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Ralphmoe wrote:
I want to put some Tung-Sol 6V6GT's but I don't know what I need in terms of soft, medium, or Hard duet. I had never heard this term until today, and I have been playing for more than 35 years. Love my SCXD! Just bought it last weekend.
Thanks,
Ralphmoe


I'm gonna go ahead and use my stock 6V6's till they're good and used up. I think they're doing a fairly good job so far. When I got my amp I had to take a floor model for a while until they got some more in stock. I think the floor model tubes must have been different because when mine came in and I plugged in it sounded louder and stronger. So maybe the floor model had weaker tubes plus it probably got used without ever warming up at all and had been there since the first ones were shipped in cuz nobody would take it because of a really bad scrape down the side.

I guess some people have the power tube buzz, but I don't think that's what I have- I'm more inclined to think it's what the previous poster was saying- I'm gonna have to check out his suggestion when I'm not so lazy. They say replacing the power tubes with some hi grade ones may improve the volume/tone a bit, but not as much as changing the speaker will.


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Posted: Sat Mar 14, 2009 5:03 pm
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Mine was a floor model. I got it for $279 last week, even though the sale price was $319 at GC. I don't think the tubes are real worn out, but I believe I'll get a little better sound changing them out.
I am kind of a tweeker, and planned on changing the tubes before I got the great price. Sorry to jack your thread.....


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Posted: Sat Mar 14, 2009 5:38 pm
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Ralphmoe wrote:
Mine was a floor model. I got it for $279 last week, even though the sale price was $319 at GC. I don't think the tubes are real worn out, but I believe I'll get a little better sound changing them out.
I am kind of a tweeker, and planned on changing the tubes before I got the great price. Sorry to jack your thread.....


Not at all, welcome to the forums! I would like to change my power tubes too just for the experience, but I figure I'll let them run down a bit so I have some use out of them. I wasn't trying to talk you out of it, but I've read from some very experienced XD users that changing the tubes won't make much difference, but others say it will- so who knows.

I've never changed tubes before and the whole tube amp experience is kind of new to me as well so I can't help you out with the terminology. I had a great tube amp when I was a kid, but I didn't even know what I had and back then I thought the "standby" on my amp was an annoying feature that only my amp had because it was such an old outdated pile of junk, if only I knew then what a cool amp it was.

I'm really liking this amp and just glad to share in the experience. I've been playing off and on for near 30 years as well and I've always went with solid state amps for the price mostly and dependability, but so much of that dependability is really bs unless your gigging and then you need to make sure you have a back up amp.

One think for sure is caution needs to be used when you change the tubes or the bottom of your feet will melt like toasted marshmellows over a camp fire. Once again- welcome to the forums!


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Post subject: Low E string buzz
Posted: Wed Apr 29, 2009 6:39 pm
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Hi Everybody, I just picked up a SCXD last week and love it.

I have run into a problem today though. When I pluck an open E string, I get a buzz. Nothing else, just the open low E string. I have read through the forums here and removed the backing boards all together.

The problem is still there. Lightly touched the tips of all the tubes. No change to anything other than my fingerprints :shock: - just kidding, knew they would be toasty.

Anyway, not the tubes. There are what looks like two transformers maybe? The smaller of the two is the one giving me grief. I lightly touch it and the noise stops. Finger off, noise returns. The two screws holding it to the chassis seem tight.

Does this seem right to anyone? Is there anything I can do to stop this myself without having to put it into the shop for a couple of weeks? I still have my Peavey Windsor Studio to play so that is not to big a problem but I would rather do a quick fix on the Fender than let someone else touch her.

Thanks for the help


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