Question about Peavey Delta Blues 115 30w All Tube Combo Guitar Amplifier

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It rattles....even with the grill off....sounds like tubes rattling but I can't tell

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There could be a small tear in the plastic liner over the speaker. If thats the case you can try pressing some cotton on it and then put the grill back in place, or find some fabric glue and glue a thin peice of fabric over the tear.

Posted on Mar 20, 2011

  • jaz90 May 07, 2012

    Mine rattled pretty bad until I tightened the power amp chassis screws up a little, 4 on top of cabinet and 2 on each side, made a big difference

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Posted on Jan 02, 2017

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The noise MIGHT be a resonance in the cabinet. The way to find out is to sweep a frequency upward to see if something rattles at certain frequencies... Don't be surprised to find several. Within the cabinet are the usual culprits: Wires rattling against the cabinet, loose debris, grilles and the logos on them, circuit boards with crossover hardware, cabinet wood that is not glued and rattles against itself. Things like bass port tubes can rattle.
Find an audio generator and sweep the cabinet from 50Hz to 10KHz and you will be surprised. Some speakers may have resonances as well. Expect things in your room to start rattling as well.
This is really the only way to find the problem. PLEASE wear hearing protectors at levels above 90Db.

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The speaker is driven too far mechanically causing the voice coil to go into a non-linear region.

The cabinet, stuff inside, grille cloth, or even a logo on the cabinet is resonant and rattles.

Your guitar setup is not quite right leading to "fret buzz"

To troubleshoot, reduce volume and see if that helps...

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BUT FIRST see if packing material worked through the speaker grill... you know littel pieces of the packing peanuts or otherr contamination that sits in the speaker cone and rattles.

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The cabinet is listed as a 4 ohm unit.

We would exoect to see four, 4 ohm speakers in series parallel or four 16 ohm speakers in parallel.

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Open the unit and power each speaker the same way individually for a test.

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