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FDP Forum / Amp Mods, Repairs, and Projects / 5E3 problems

dubtrub Contributing Member USA, California	Jan 19th, 2007 10:45 AM   Edit   Profile   Print Topic   Search Topic My Weber tweed deluxe that I built last summer has suddenly decided to give me problems. Occasionally while playing it will start an extremely loud squeal or screeching noise. Sounds like it's about to self destruct. I've noticed that while creating this terrible noise, the chassis becomes temporarily microphonic if I tap on it with a guitar pick. I have opened it up and checked all the connections with a wooden 'chopstick' and it seems that no matter where I tap the sound will start. Then for no apparent reason it will quit and play fine for a few hours before it start again. Although I built the amp as a kit, I really do not know much about electronics. I think the sound is coming from the pre-amp section as I can turn down the squeal with the volume control with which ever channel I'm plugged into. It will squeal on either channel. I have replaced every tube including rectifier but it still happens. It seems like any vibrations or bump on the cabinet can sometimes but not always start the squealing . I keep thinking it is a loose connection but I cannot locate the source. Any help would be much appreciated. Thanks! Danny (This message was last edited by dubtrub at 04:37 PM, Jan 19th, 2007)
Brockville Contributing Member Canada	Jan 20th, 2007 12:51 PM   Edit   Profile   Print Topic   Search Topic Have you checked that your input jacks are making a good connection to ground when there is nothing plugged into them? After some wear and tear the ground connection on cheaper jacks will tend to fail. You can test it by plugging into all four jacks and see if the squeal goes away.
dubtrub Contributing Member USA, California	Jan 20th, 2007 01:18 PM   Edit   Profile   Print Topic   Search Topic Brockville, thanks for your response. You may be on the right track as I noticed that when the squeal was active, if slip the wooden probe into the jack and broke the contact the noise would subside. I'll focus more in that direction. At the time I was perplexed and didn't even consider that to be the source of the problem. At least that gives me some hope. Thanks! Danny (This message was last edited by dubtrub at 02:13 PM, Jan 20th, 2007)
Pirate Contributing Member ********* The Key to Life Pamadmahlmik !!!	Jan 20th, 2007 01:28 PM   Edit   Profile   Print Topic   Search Topic There was a discussion about grounding the input jacks with a wire from the jack to the brass plate here recently. This may be a way to go if that's the problem, then you're sure not to have that grounding be an issue again.
dubtrub Contributing Member USA, California	Jan 20th, 2007 02:18 PM   Edit   Profile   Print Topic   Search Topic BINGO! That was the problem. Now I know why it is considered an upgrade to get better quality jacks. I was able to re-bend the terminals to make a solid contact. Eliminated the squeal plus it virtually eliminate all the noise. I recalled when I first built the amp it was as quiet as a church mouse. And so it is again. I will do a search regarding the use of a ground wire. Thanks Again! Danny
Brockville Contributing Member Canada	Jan 22nd, 2007 05:30 PM   Edit   Profile   Print Topic   Search Topic Danny, Glad to hear it worked out for you. Re-bending should keep it quiet for a while but you should consider replacing them with Switchcraft jacks.

FDP Forum / Amp Mods, Repairs, and Projects / 5E3 problems

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