| feed back with volume down? [message #7873] |
Mon, 13 November 2006 13:07  |
mommytime
Messages: 42
Registered: August 2006
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Member |
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Good Day All,
OK, maybe my K200 B5 is burning up inside.
I now get a feed back ‘howl’ which builds slowly on its own, even with the volume turned down.
The sound is feedback like, but its not actual feedback. If I start playing while the amp is making this sound it will actually stop building the feed back sound until I stop playing, then it starts again.
If I simply turn the amp on it doesn’t make this sound, I have to strike a note or chord to get it started, but after it starts I can’t stop it unless I simply play over it. Playing over it DOES make the unwanted sound dissipate, it ALMOST stops completely
Any ideas what would cause this?
Thanks, have a good week.
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| Re: feed back with volume down? [message #7886 is a reply to message #7873] |
Fri, 17 November 2006 23:41  |
Optyk
Messages: 125
Registered: August 2006
Location: Texas
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Senior Member |
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Strange thing, but I had this exact same phenomena happening on myh k200-B5 head. It happened regardless of whether any or all four channels were turned on or turned off. It happened regardless of whether anything was plugged into the inputs. Changing volume or treble or bass or reverb settings on any/all channels seemed to make no difference in the squeel. Even with the reverb turned off on all channels, I got the squeel. For some reason, I figured it had something to do with the reverb, so last night, I took the unit out of the housing, unplugged the reverb tank from the main board, removed the screws and took the tank completely out. Running the amp without the reverb tank gave me no feedback, so I knew I had the culprit located, at least I knew whatever it was was inside the tank assembly.
So I took a razor knife and very carefully slipped the blade underneath the rubber/felt covering that seals the tank. When I got inside and could see, I discovered there was a piece of paper that ran the length of the inside of the tank. It looks like it was originally on the inside side of the rubber felt covering, but age had made it peel off so it was just a loose piece of paper resting on top of the springs inside. I debated on whether to try to reattach it to the covering, but finally decided to just leave the paper out completely. So using duct tape, I sealed the covering back to the tank, sealing it up again. I remounted it, plugged everything back in and fired it up. (I realize I may have to open the unit back up and use some sort of glue to reattach that covering and get rid of the duct tape, but this was a temporary fix so I could test to see if it made any difference.)
No feedback so far. I cranked it up loud with a guitar running into it. Cranked all 4 channels up simultaneously (not maxed out, of course) and still no feedback. If this actually fixes it, this is a real cheap fix. I'm going to give the amp a workout this weekend and see if I can get it squeeling again. I'll report back first of the week and let you know how it turns out.
Rod
PS, I don't know if this is actually true or not, but it seems to me like the reverb sounds much richer now than before. It might just be my imagination, but man, my Gretsch DuoJet sounds sweet running into that unit now.
There's only two kinds of music. . . . blues and zippity doo dah.
[Updated on: Fri, 17 November 2006 23:52] Report message to a moderator |
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| Re: feed back with volume down? [message #7888 is a reply to message #7886] |
Sat, 18 November 2006 10:34 |
Optyk
Messages: 125
Registered: August 2006
Location: Texas
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Senior Member |
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OK, I got up this morning and put the unit through its paces and unfortunately, it's still feeding back, so ignore my previous message. I'll post again if I can figure out what it is that's causing this.
Rod
There's only two kinds of music. . . . blues and zippity doo dah.
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| Re: feed back with volume down? [message #7889 is a reply to message #7888] |
Sat, 18 November 2006 20:48 |
mommytime
Messages: 42
Registered: August 2006
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Member |
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I am lucky.
I was about to pull the head apart, screw drivier in hand, and my door bell rang.
It was my new '67telestar guitar...I had plug too it in, I did and there was NO feed back!
So try this, everytime you approach your amp, do so with your fingers crossed, its working for me.
IF it starts again I'll let everyone know, cuz its important!
Thanks for sharing, I hope luck is on your side too.
Mommytime
LSD-Putting the inert back in inertia.
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| Re: feed back with volume down? [message #8647 is a reply to message #7873] |
Fri, 01 June 2007 15:03 |
mommytime
Messages: 42
Registered: August 2006
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Member |
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Correct, I can't hear the sound with out speakers plugged in, but I can tell that the sound/ocillation stops and restarts each time I plug and unplug the speakers, as opposed to it coninueing to build whether the speakers are plugged in or not.
I will tap around.
Thanks
LSD-Putting the inert back in inertia.
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| Re: feed back with volume down? [message #8709 is a reply to message #8648] |
Thu, 28 June 2007 23:31 |
RoyC
Messages: 97
Registered: April 2000
Location: East Central Illinois
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Member |
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Here's something to try (if you haven't already)
Where the reverb tank plugs into the amp itself (RCA plugs?), pull those plugs out and clean them. You might get lucky.
Several years ago my K200-5 was making it's own noise, much like what you're describing, and after cleaning the plugs, it hasn't done it since.
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