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Post by manbearpig on Oct 9, 2012 17:59:21 GMT -7
My Ghia is exhibiting a little bit of fizziness--it's slight but noticeable--as notes decay. I tried changing out el84s and had no change. Before pending too much more time troubleshooting I thought I'd see if this is a known or obvious issue here. If not, I suppose I should next work through the preamp tubes?
Thoughts?
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Post by Lefty on Oct 11, 2012 11:11:09 GMT -7
Check your pre amp tubes and report back.
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Post by manbearpig on Oct 11, 2012 18:37:15 GMT -7
Check your pre amp tubes and report back. Hey Lefty. Have now checked all tubes, including rectifier, to no avail. Still getting that tinny, fizzy sound as the notes decay.
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Post by Eddie on Oct 11, 2012 22:33:19 GMT -7
What you are describing could be voice coil rub.
What speaker(s) are you using?
Do you have another speaker you can try?
Eddie
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Post by Maddog on Oct 12, 2012 4:15:20 GMT -7
+1000 what Eddie said...also re-tighten your chasis/cabinet mounting bolts firmly....
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Post by manbearpig on Oct 12, 2012 10:56:22 GMT -7
Thanks Eddie and maddog. I'll give both of those things a try when I get home from work and reort back. Eddie, I'm using a g12h30 in a Z 112 cab but I do have another I can try. I will say it doesn't sound like the speaker because it he fizziness is the same relative to the volume no mater how loud I have the amp, including when it's attenuated to very low volumes where the speaker really isn't doing anything much
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Post by manbearpig on Oct 14, 2012 18:08:24 GMT -7
So it isnt the speaker or anything mechanical in the tubes or chassis. I had some time today to do some troubleshooting with several guitars, several tubes, and another amp so I could double check tube and speaker performance. There are still a couple of other ideas I have to check--one is that I attenuate and I havent had the opportunity to play without the attenuator (I suppose the attenuator could be introducing the fizzy decay sound). I'll let you guys know if/when I solve this. Please let me know if anyone has any other ideas for things to try.
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Post by Lefty on Oct 18, 2012 13:27:34 GMT -7
First rule of trouble shooting is simplify the signal chain.
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Post by jlc on Oct 18, 2012 19:18:09 GMT -7
guitar, good cable, amp.
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Post by manbearpig on Oct 19, 2012 15:08:46 GMT -7
Good advice. And I should probably try some other guitars too. Could it be a problem with the guitar's electronics?
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Post by prspastor on Oct 22, 2012 4:58:58 GMT -7
I am almost 100% sure that the fizzyness in the decay of your notes is from high attenuation. This is something I've observed in my own amps - any of them - when I attenuate. It always seems to be introduced from about -7 db on up. I've always interpreted it as some compression that occurs due to attenuation. I do know what you are talking about though and nothing is wrong with your amp or attenuator. Just gotta play louder!
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Post by manbearpig on Oct 26, 2012 17:06:18 GMT -7
I am almost 100% sure that the fizzyness in the decay of your notes is from high attenuation. This is something I've observed in my own amps - any of them - when I attenuate. It always seems to be introduced from about -7 db on up. I've always interpreted it as some compression that occurs due to attenuation. I do know what you are talking about though and nothing is wrong with your amp or attenuator. Just gotta play louder! I think this was it. Just had the opportunity to crank up unattenuated. Sounded great!
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