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Post by fjam82 on Dec 24, 2008 21:24:42 GMT -7
Just turned my RXES on for the first time since the summer and there's a loud hum. I don't even have to plug in, when the standby is on it hums. I just replaced the ef86 a few weeks before I played it last.
Any ideas? Suggestions?
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Post by cementedman on Dec 24, 2008 21:32:11 GMT -7
first off i would try changing out the rectifier tube.
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Post by fjam82 on Dec 24, 2008 22:22:08 GMT -7
thanks.. now I'm not at all tube savvy.. which brand of 5AR4 do you reccomend?
JJ, Shuguang, Sovtek & Weber Coppercap are all options on the tubestore website.. The Mullard is not within my budget...
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Post by zdogma on Dec 25, 2008 18:01:37 GMT -7
Just turned my RXES on for the first time since the summer and there's a loud hum. I don't even have to plug in, when the standby is on it hums. I just replaced the ef86 a few weeks before I played it last. Any ideas? Suggestions? Hi Chris. I agree, the rectifier seems ike a likely culprit, I had a loud mechanical hum on standby from a bad rectifier one time, you could hear it coming from the chassis too, not just from the speaker. Bad filter caps and other tubes can do it as well, but I don't think you notice them when you're on standby. Maybe tighten up the chassis bolts too.
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Post by fjam82 on Dec 25, 2008 20:56:24 GMT -7
Just turned my RXES on for the first time since the summer and there's a loud hum. I don't even have to plug in, when the standby is on it hums. I just replaced the ef86 a few weeks before I played it last. Any ideas? Suggestions? Hi Chris. I agree, the rectifier seems ike a likely culprit, I had a loud mechanical hum on standby from a bad rectifier one time, you could hear it coming from the chassis too, not just from the speaker. Bad filter caps and other tubes can do it as well, but I don't think you notice them when you're on standby. Maybe tighten up the chassis bolts too. Thanks Scott!
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Post by benttop (Steve) on Dec 26, 2008 15:55:50 GMT -7
Power tubes. If one goes gunnysack you can get a nasty hum. They need to be matched or you can have a hum.
Having a backup recto and power tubes is always a smart move with a tube amp. Get both, you'll be set one way or the other.
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Post by fjam82 on Dec 28, 2008 21:15:10 GMT -7
Power tubes. If one goes gunnysack you can get a nasty hum. They need to be matched or you can have a hum. Having a backup recto and power tubes is always a smart move with a tube amp. Get both, you'll be set one way or the other. Thanks for the help Steve, I swapped in a spare set of el84's and then did some troubleshooting with zdogma over the phone and it ended up being my 12AX7. But it could have been one of the EL84's as well, not sure. Thx again
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Post by benttop (Steve) on Dec 29, 2008 8:46:17 GMT -7
Yeah, we tend to forget the preamp tubes because generally they are pretty reliable. But they can fail too, as you've just learned.
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