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Paw

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http://www.lightningmp3.com/live/68063-mk4problem.mp3

...and tell me what the hell is wrong with my Mark IV :(

Although you can hear it, I'll describe the problem: It's some kind of weird distortion that sounds very fuzzy and greatly reduces sustain and volume. If I strike the strings hard, the amp will produce a loud sound with the apparent fuzz. If I play the strings gently, it produces a very silent sound that fades out very quick. The fuzz is present with every note I play. It's most notable at the clean channel because it's so clean, but it's also present on the other channels.

This "thing" happened once in a while before I changed out the stock tubes, but it was easily fixed by striking the strings hard (it would "pop" back to its original sound) or by switching it to standby and back again. I thought the problem was the tubes, and I changed them all just a few weeks ago. Now the problem is back and the old "methods" wont cure my amp :( Every time I turn on my amp it's like that.

I've ruled out the following to be the cause of the problem: preamp and power tubes, guitar(s), guitar cable, amp/cab cable, cabinet

The clip is a raw take with a sm57. The dynamic response is only adjusted by how hard I hit/play the strings, although I raised the volume on the lead channel in the last third of the take. I go from rhythm 1, to rhythm 2, to lead, and back to rhythm 1 the last seconds of the clip.
 
JOEY B. said:
Dirty or faulty FX loop jack? Try running a pafch cord from the send to the return.

Thanks for the tip man, but it made no difference:(
 
my guess: a cold or broken solder connection on one of the power tube sockets


good luck
 
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