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Old 09-20-2014, 05:19 PM   #1
musicandthewave
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amp gets quiter after couple minutes and turns very fizzy almost like a fuzz tone

i have a blackstar ht-1 combo amp. It has a gain switch, not a channel switching amp.

ive had it for 6 months with no problems until 3 days ago when the amp got quieter suddenly, after a couple of seconds of being quieter it changes the tone to become really fizzy and almost like a fuzz pedal sound. i have the audio clip of when the amp gets to that fizzy point.

http://www.4shared.com/mp3/t18PlIqxba/ampproblem.html
the warbling noise are palm muted notes. single notes sound clearer but still sound very bad


if i turn off the amp and turn it right back up it goes back to normal but then does that again after a couple of minutes. I though it would only happen in the gain stage but in the clean channel it does it as well. what could it be?


If i do palm mutes on hi gain, the amp rattles slightly a bit, could months of that caused this problem?

Last edited by musicandthewave : 09-20-2014 at 05:22 PM.
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Old 09-20-2014, 05:38 PM   #2
Robbgnarly
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get some new tubes and you should be good.
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Old 09-20-2014, 05:41 PM   #3
darkwolf291
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It's modelling valve power amp output valves wearing out.
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Old 09-20-2014, 05:51 PM   #4
Fisheth24
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Quote:
Originally Posted by darkwolf291
It's modelling valve power amp output valves wearing out.


I wonder if you throw it out the window it'll have emulated tube tone
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Old 09-20-2014, 05:58 PM   #5
musicandthewave
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Quote:
Originally Posted by darkwolf291
It's modelling valve power amp output valves wearing out.


it's not a modeling amp, but its a tube amp
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Old 09-20-2014, 05:59 PM   #6
Robbgnarly
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Quote:
Originally Posted by musicandthewave
it's not a modeling amp, but its a tube amp

actually it is a hybrid amp part tube, part SS
change the 2 tubes and you should be sorted or a tech will need to take a look
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Old 09-20-2014, 09:43 PM   #7
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IIRC the power tube needs rebiasing when you change it.
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Old 09-20-2014, 11:14 PM   #8
dreid77447
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change the tubes and make sure they're biased-- should fix the problem
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