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Post by ss "Shane" on Jan 20, 2018 9:50:48 GMT -7
Y’all don’t disown me but I bought and just received my new AC10C1 with a greenback 10 for practice. It’s a wonderful amp with extremely usable tones for me. Here is my issue:
When I turn it off it makes a little bit of a percussive sound, almost like it’s giving the speaker a little bit of a push. It’s something that I can surely live with because the amp sounds so good, but is this a symptom of an underlying problem? Oh, it also does it when powering on but not nearly as noticeable. Thanks guys!
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Post by ss "Shane" on Jan 20, 2018 10:28:38 GMT -7
Just read about another guy’s ac10 doing the same thing so I’m less concerned. Still curious as to if this will cause problems though.
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Post by BritInvasion on Jan 20, 2018 10:41:39 GMT -7
Does it do it with the master volume and all the way off? Some sound when engaging the power switch is normal when you flip it with the volume on.
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Post by ss "Shane" on Jan 20, 2018 10:49:50 GMT -7
Does it do it with the master volume and all the way off? Some sound when engaging the power switch is normal when you flip it with the volume on. Good question, hadn’t tried that yet. I’ll have to see when I get back to my amp.
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Post by Chilly Gibbons (Todd T.) on Jan 20, 2018 15:57:54 GMT -7
By percussive, do you mean a pop?
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Post by ss "Shane" on Jan 20, 2018 17:29:25 GMT -7
By percussive, do you mean a pop? yep, but like a puff of air pop that the speaker is making. I got home and powered back up. I turned volume and master all the way down and it didn’t make a single noice when I turned off. Weird
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Post by BritInvasion on Jan 20, 2018 19:36:54 GMT -7
By percussive, do you mean a pop? yep, but like a puff of air pop that the speaker is making. I got home and powered back up. I turned volume and master all the way down and it didn’t make a single noice when I turned off. Weird's Check the owners manual , I think it states to turn the volume off when powering down. It's the switches location in the circuit that makes an audible thump when the contacts are switched over. Totally normal.
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Post by zpilot on Jan 21, 2018 0:02:34 GMT -7
I don't have a schematic but I think that is the sound of the filter caps discharging.
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Post by ss "Shane" on Jan 21, 2018 5:14:57 GMT -7
yep, but like a puff of air pop that the speaker is making. I got home and powered back up. I turned volume and master all the way down and it didn’t make a single noice when I turned off. Weird's Check the owners manual , I think it states to turn the volume off when powering down. It's the switches location in the circuit that makes an audible thump when the contacts are switched over. Totally normal. yeah, “thump” is a much better word. I really hate trying to come up with adjectives to describe sound lol. Anyway, all is well and the amp is much more than I expected in a good way. Just ordered tubes so I should be set. Btw...I’m very thankful for each and every member in this forum who gives attention to helping people out. Now the most Vox-like Z amp search begins but that’s another thread! 😄
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bradm
Junior Member
Posts: 74
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Post by bradm on Jan 31, 2018 14:50:24 GMT -7
I think percussive hits it correctly. Yeah, you're hearing the effect of inrush current surges as everything is energizing. Turning the volume down minimizes which parts of the amp (i.e. preamp) contribute to it. Some IC amps LM3886 or something similar) are prone to it with a very basic circuit. It's always there. That's where good design comes in and ramps up voltages to the various stages so "everything doesn't power up at once". Volume control down is the easy fix! Redesigning the circuit would cost you more than the amp is worth. Cheers! BradM
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