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Post by greglecompte on Nov 23, 2010 9:16:14 GMT -5
when i take my nitro off of standby the a loud cloud of white noise even if i have my guitar volume down all the way if i have it up and start playing it grows and volume and the white noise dies down and doesn't come back till the next time i turn the amp off and the next time after the map is turned off what could be causing this?
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Post by sasquatch on Nov 23, 2010 10:30:05 GMT -5
Any chance you're using a noise suppressor?
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Post by greglecompte on Nov 23, 2010 11:14:58 GMT -5
yes i am using a noise supressor
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Post by sasquatch on Nov 24, 2010 11:03:40 GMT -5
You might try taking the unit out of the loop and/or chain and see if it still does it. That "growing in volume, then dying down" description sounds like it may have something to do with the noise reduction unit. If it still does it then I would look to the tubes before taking it to a tech. I would try replacing (preferred) or swapping V1 and V2 in the preamp section first. If that didn't solve it then I would try a different set of PT's. Good luck!
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Post by greglecompte on Nov 24, 2010 12:59:05 GMT -5
when i run a noise suppressor in the loop and front it stops it and it only happens when i initially take it out of standby i have new tubes and changed the pres and it still dose it but it seems as if my pts still have life in them the bias is still holding at 51 (kt88s) so it seems fine besides that
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Post by sasquatch on Nov 24, 2010 17:44:13 GMT -5
So the white noise is consistent with no noise reduction unit running? And... by white noise are you referring to preamp hiss, or something else? If the NS-2 eliminates the noise but it comes up when going from standby to on, then goes down, then I gotta think it's the NS-2 just taking a second or so to see the signal and to kick in when you first turn on the amp. If you have access to another unit (Decimator, or other), try it and see if it works any better.
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Post by greglecompte on Nov 24, 2010 20:19:51 GMT -5
its just wierd cus if i plug straight in it theres a loud hiss and ill play a little bit and it takes a while for my guitar volume to come through the hiss but after a little the hiss just dies down with and without the ns-2
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Post by sasquatch on Nov 25, 2010 11:54:24 GMT -5
That sounds more like a tube issue to me. Or... possibly even a bad cord. Does it do it in the clean channel? If not... try swapping the preamp tubes. The culprit is usually either V1 or V2 if it's only happening in the gain stage.  |
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Post by greglecompte on Nov 25, 2010 12:12:29 GMT -5
ok thanks im betting its a power tube i just changed the pres and it still dose it they are about a year old so i guess its their time
thanks for the help happy turkey day
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