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Crackling sound at high volume
Crackling sound at high volume
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Old 5th March 2020, 01:23 PM   #21
Tesla88 is offline Tesla88  Italy
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A dummy load is a resistive load a speaker is not. +

But I would check first the connection between head and cab, since it happen only with the 8 ohm cabinet I suspect the jack at cabinet to be faulty or simple it vibrates too much.
I had a 2x12 cab with a loose back panel, at high volume a good palm mute would throw the jack out of the socket
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Old 5th March 2020, 01:57 PM   #22
RadioOctave is offline RadioOctave
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Quote:
Originally Posted by Tesla88 View Post
A dummy load is a resistive load a speaker is not. +

But I would check first the connection between head and cab, since it happen only with the 8 ohm cabinet I suspect the jack at cabinet to be faulty or simple it vibrates too much.
I had a 2x12 cab with a loose back panel, at high volume a good palm mute would throw the jack out of the socket
Great idea. I checked through another Mesa Cab, same prob

j

Last edited by RadioOctave; 5th March 2020 at 02:05 PM.
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Old 5th March 2020, 05:06 PM   #23
RadioOctave is offline RadioOctave
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Just spent 20 minutes playing the amp dime'd across the board at 16ohm with zero issues. 8ohms...thats another story.

Could it be the OT?
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Old 6th March 2020, 07:27 PM   #24
RadioOctave is offline RadioOctave
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More testing

-two 8 ohm 4x12 cabs in parallel with amp at 4ohms. crackle.
-one 8 ohm 4x12 cab with an 8 ohm 2x12 with amp at 4 ohms. NO CRACKLE?

The 4x12 is a mesa with 4 v30s. The 2x12 is a peavey 4x12 in stereo, using only one side with sheffield something or others.

This is banana crazy now.

Anyone have any ideas?!
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Old 7th March 2020, 09:14 PM   #25
RadioOctave is offline RadioOctave
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Found it.

Heater wires were too close to chassis causing the parasitic oscillation. I dont know why the chassis would be so susceptible, but raising the heaters 1cm from the chassis eliminated the sound.

Just thought I would close the loop on this.

j
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