# Popping when powered down
**URL:** https://forum.psaudio.com/t/popping-when-powered-down/22189
**Category:** Audio Components
**Created:** [February 27, 2021, 5:29pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189 "2021-02-27T17:29:16Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@james-waldo](https://forum.psaudio.com/u/james-waldo)
#### Post date: [February 27, 2021, 5:29pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/1 "2021-02-27T17:29:16Z")
Not a big deal, but my BHK system now gives me a startling pop when I power it down after a listen. didn’t used to and plays fine other than that, does it if its cd or phono, so I’m pretty sure its amp or pre. any Ideas ?
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### Author:  [@watchdog507](https://forum.psaudio.com/u/watchdog507)
#### Post date: [February 27, 2021, 6:20pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/2 "2021-02-27T18:20:02Z")
One word. “Tubes”
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### Author:  [@sixpack1](https://forum.psaudio.com/u/sixpack1)
#### Post date: [February 27, 2021, 7:11pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/3 "2021-02-27T19:11:01Z")
Is your amp a BHK 250 or 300? The tubes in my 250 do not last very long before they start to do exactly that! I just ordered another set for my amp. It is most likely in the amp and not the preamp.
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### Author:  [@james-waldo](https://forum.psaudio.com/u/james-waldo)
#### Post date: [February 27, 2021, 8:29pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/4 "2021-02-27T20:29:09Z")
I suspected tubes, i do have the 250, my first tube set up, they dont have a ton of hrs on them but are almost two years old. thanks for the tip.
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### Author:  [@Famavolat](https://forum.psaudio.com/u/Famavolat)
#### Post date: [February 27, 2021, 8:53pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/5 "2021-02-27T20:53:24Z")
BHK300’s/tubes about 430 hours.
About 400 hours in started hearing a pop through right channel only when pressing MUTE on & off on Audio Research LS28 preamp. Similar issue with previous tubes - that time POP heard through left channel only, which reached the point where the amp would go into protection & shut down. About a week ago the POP stopped. Pleased but not sure what to think about that.
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### Author:  [@peroo](https://forum.psaudio.com/u/peroo)
#### Post date: [February 28, 2021, 10:19am UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/6 "2021-02-28T10:19:04Z")
I had the same problem with popping, one of my new Genalex gold lion tubes had failed after only three months of use.
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### Author:  [@jamesh](https://forum.psaudio.com/u/jamesh)
#### Post date: [February 28, 2021, 3:22pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/7 "2021-02-28T15:22:53Z")
I’m going to guess tubes as well. I’d try the amps first, but ultimately you may want to swap all of them.
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### Author:  [@james-waldo](https://forum.psaudio.com/u/james-waldo)
#### Post date: [March 6, 2021, 2:31pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/8 "2021-03-06T14:31:21Z")
Thanks to all, the new tubes went in yesterday, problem solved. FYI, I purchased my amp and pre 2 years five months ago, I would put an estimate at 1000 hrs of use. I can live with that they sound fantastic and I am very satisfied with them.
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### Author:  [@jamesh](https://forum.psaudio.com/u/jamesh)
#### Post date: [March 6, 2021, 2:57pm UTC](https://forum.psaudio.com/t/popping-when-powered-down/22189/9 "2021-03-06T14:57:20Z")
Glad the tubes worked. Thanks for keeping us posted!