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Buzzing/vibration sound in amp on low notes - help please


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UPDATE-

 

I managed to get the amp apart - had to unscrew one of the small valves and ease the chassis out.(small victory)

 

I tested the amp with the guts open by sitting the speaker on the amp and looking for buzzes vibrations, inside the amp.

 

The parts I found were buzzing, I have siliconed are

 

- the screwholders(that hold the chassis inplace)

- the 4ohm-8ohm switch, against the insaide of amp

 

After extensive testing/ rechecking there is no more buzzing inside the amp

 

BUT

 

the speaker still buzzes inside - its slight but annoying

 

I put everything back together and the buzz is still there on the low E string about A-B notes.

 

So I geuss the speaker is faulty ?? anything else I can do to try and fix this?

 

If not I geuss Im looking for a new speaker. Advice please on recommended speakers for this amp.

 

Ive started a thread here

 

http://acapella.harmony-central.com/forums/showthread.php?s=&threadid=1251585

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  • 13 years later...
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I have a Roland JC-40, only 7 months old, and I'm experiencing the exact same issue as this gentleman is- vibration from the speakers at low notes only. AND it comes and goes as well. One minute, its fine. The next, its Buzz city on the low notes

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  • 8 months later...
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On 5/17/2006 at 12:20 AM, BoyoMcLadd said:

Play the offending note and press up on a tube from the bottom.You can do this with a pencil eraser although I do it with my finger.If it stops rattling , thats your tube.

Also , put it up on a sofa and look at the guts while playing.My amp had rattling from wires touching the chassis floor.If you see a wire bouncing that's part of your prob.

Walk around the room and make sure it doesn't get louder as you walk away.A hanging picture frame for instance.

 

Pressing up on a tube with a finger when an amp is on is generally not a good idea. The plate voltage on tubes can easily range from 300 to 600 volts.

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