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Post subject: Superchamp XD Trouble
Posted: Sat Mar 13, 2010 6:42 pm
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To the certifiable geniuses of this forum, I present to thee a quandary:

About an hour ago, I was playing through my Fender Superchamp XD with no issues whatsoever. I turned the amp off for about twenty minutes whilst I left to attend to something else, and then returned to resume playing.

Guitar plugged in, I turned the device on. However, all I got back were odd clicks and pops, and I immediately knew something was up. I turned it back off to try and avoid any potential damage, and investigated from the back of the amp. There were no odd smells or sights, and the fuse hadn't blown so I figured it must have been a fluke. But when I switched it on again, despite the power LED lighting, there was absolutely no noise whatsoever, not even speaker hiss. I turned the volume up and down, switched over to the other channel, but to no avail.

With all tubes glowing at normal intensities, and no weird hums or fizzes, I assume it to be the speaker. When I attached the amp to my computer via the line out, I can record from it just fine.

Aside from the speaker, could anything else be causing this? Why would this happen in the first place?

Edit: Laptop plays music through the speaker, so i know it works. I'm at a loss.


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Posted: Sat Mar 13, 2010 10:32 pm
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Hi Transmission, if I have this straight, you can get a signal from the line out to your computer and the speaker works? If this is the case, I would suspect the phase inverter tube(12AX7) is at fault or the power tubes. The 12AX7 could be easily replaced, but the power tube replacement would require a bias adjustment. You could try the 12AX7 swap, but if that doesn't do it, a trip to the tech would be in order. BTW Welcome to the forum. Art

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Posted: Sun Mar 14, 2010 5:19 pm
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aclempoppi wrote:
Hi Transmission, if I have this straight, you can get a signal from the line out to your computer and the speaker works? If this is the case, I would suspect the phase inverter tube(12AX7) is at fault or the power tubes. The 12AX7 could be easily replaced, but the power tube replacement would require a bias adjustment. You could try the 12AX7 swap, but if that doesn't do it, a trip to the tech would be in order. BTW Welcome to the forum. Art


Exactly the same thing happened to me as you describe. This suggestion to replace the 12AX7 is what fixed it. They are not real expensive, you'll just have to wait for it to ship. My old tube was "lit up" also, but no sound came out of the amp. I read somewhere that the SCXD only uses "one side" of the pre-amp tube as a phase inverter (like aclempoppi states).


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