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Old March 26th, 2009, 09:56 PM   #1 (permalink)
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Tube Amp White Noise ?

what causes white noise not a buzz or hum just white noise that goes up with vol or gain, cant really hear it at bedroom level just turned up ?

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Old March 26th, 2009, 10:25 PM   #2 (permalink)
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Usually it's the plate resistors in the preamp. Carbon composition are usually what's in there, wirewound would be much quieter, but it's hard to make a wirewound small and cheap enough for the values needed, usually 1/2 watt, 100k ohm.
see this-
http://www.aikenamps.com/ResistorNoise.htm

I have found that replacing the plate resistors on the first two preamp triodes with metal foil types makes a huge difference if there were carbon comps in there to begin with.
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Old March 26th, 2009, 10:48 PM   #3 (permalink)
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Probably because your guitar isn't loud enough. Or maybe it's not plugged in?

Is the noise bothersome when playing or just when you're not?
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Old March 26th, 2009, 11:10 PM   #4 (permalink)
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Its only when im not playing when i notice it, maybe its normal, this is the first all tube amp i have owned so im not sure, just curious .
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Old March 26th, 2009, 11:24 PM   #5 (permalink)
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It's normal, then. Tubes, and the associated electronics, are archaic by today's standards. If you're used to solid-state and hi-fi, the noise may be a bit bothersome at first but you get used to it.
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Old March 26th, 2009, 11:32 PM   #6 (permalink)
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oh yes the noise, playing a tube amp and a telecaster i've tried everything available. Even bought an ISP noise decimater. The sooner you get used to it the better. Try moving to a new room and see if it changes though, my roommates tv gives me noise. Some lights do too.
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Old March 26th, 2009, 11:48 PM   #7 (permalink)
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You know i guess i really didnt notice it till i moved into an extra bedroom, could be the ceiling fan or something, thanks for the advice !
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Old March 27th, 2009, 01:43 PM   #8 (permalink)
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If you've got compact fluorescent light bulbs, they can cause a decent amount of noise... I noticed that when I put them in my practice room. I've got to place the amp just right to minimize it, and keep the single-coils pointing away too...
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Old March 27th, 2009, 02:05 PM   #9 (permalink)
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I like that white noise. and the smell too. nothing beats a tube amp. so far anyway.
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