start up and shut down noises

DuaneWhitney · 1025

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Offline DuaneWhitney

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on: July 08, 2018, 04:53:38 PM
My mainline makes noise for a second or two on start up and shut down.  Is this something I should be concerned about, or is this normal?  I'm wondering if a muting delay would be beneficial. 


Offline adydula

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Reply #1 on: July 09, 2018, 04:55:35 AM
Hello..

What kind of noise??

Alex


Offline Paul Birkeland

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Reply #2 on: July 09, 2018, 05:27:21 AM
This is very normal.  A muting relay would prevent you from hearing the noise, but may otherwise decrease reliability.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adydula

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Reply #3 on: July 10, 2018, 02:40:42 AM
I have noticed when I change headphones while the amp is on I hear a low sound for 1-2 seconds at most which goes away. Seems like the amp is getting reset for the new device or load?

Alex


Offline Paul Birkeland

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Reply #4 on: July 10, 2018, 04:57:48 AM
No, but rustling the chassis can stir up microphonics a little bit that will settle in a few seconds. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adydula

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Reply #5 on: July 12, 2018, 11:52:04 AM
I know this is a Mainline thread, but related to that "chassis" upsetting thought I have both my mainline and crack about a foot away from my pc keyboard and with some tubes like the coke bottle
RCA 6AS7G's when I am typing while listening I can hear my keystrokes as a dull thump sound, if i change to a non coke bottle version built mucm more solid I dont get this sound at all.

No big deal, just be aware of what tubes bring to the table!!

Alex


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