Question:
When Tubes Are bad?
Answer:
There's an obvious deteriotation in the sound that you liked. My started to get noisy and very muddy sounding.
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Well the thing is used when i got it so I was wondering if there was any way to know. It nots rlealy muddy but it makes this funky nosie and then when im turn the volume off on my guitar theres hecka alot of noise.
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Originally Posted by guitarjockey111 Well the thing is used when i got it so I was wondering if there was any way to know. It nots rlealy muddy but it makes this funky nosie and then when im turn the volume off on my guitar theres hecka alot of noise. if that noise is a new thing, that could either be the results of the filter caps going bad, or the pre-amp tubes getting microphonic. I'd replace the pre-amp tubes first and see if that changes things.
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Ahh that could be it didnt think about that.
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Originally Posted by guitarjockey111 It nots rlealy muddy but it makes this funky nosie and then when im turn the volume off on my guitar theres hecka alot of noise.
To me, this sounds like more of a dirty potentiometer (or "pot" for short) connected to your volume control, if you mean that it's really noisy while you're moving the volume knob.
If it's really noisy even after you've set the volume knob to "0," then I would start looking at preamp tubes - especially the "VI" or "first position" preamp tube, basically the first tube that the signal is routed through. If that tube is noisy, then the noise gets amplified many a time between there and the loudspeaker.
Nate
Answer:
First, pull each tube out and put it right back in, often re-seating a tube will cure a funny noise problem due to poor connectivity of tube pin to socket. I would also make sure its an amp problem, and not a guitar, cord, or pedal/whatever problem. Does it do it with a different guitar and different cord straight into the amp? Does it make a noise with no cord plugged in?
Tubes - Buy just one 12AX7 preamp tube, you should have a spare for failure and troubleshooting anyway, kinda like having a spare tire in yer car. Swap it out with each of the preamp tubes; if it stops, that tube was bad. If not, you could buy a set of power tubes and swap those out to see if that fixes it.
Is this a high gain amp, or are you running a high gain type distortion device, or boosting the front end of the amp? All tubes are microphonic to some degree, the higher the gain of the rig, the more significant and problematic that microphonicity (yeah, I made that word up) becomes. You can test the tubes for excess microphonicity - with it powered up, nothing plugged in, crank it up to a fairly high volume level, and tap on the tubes with something that won't crack them, like a wood pencil. You should be able to hear all of them some, especially the preamp tubes, but if one stands out as being much worse than the others, that could be your problem.
Maybe you could be a little more descriptive of the nature of the noise, or even record it.
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thnx for all the sudgestings all i pull them out and pop em back in tommorw.
the noise when i turn my TS9DX off and turn my guitar off or unplug it the speaker makes nosie and hums and stuff and not like a little like noraml amps it goes insane. Id record it if i coudl but i wouldnt be able to no mic.
And it could be a dirty pot cause when the gain is dow nit doesnt hum as mcuh but they higher the gain the l0worse it gets. and the amp is a pignose G40v.
I got a trhead about it somewere on here ill add a link if i can find it. cause it gots pics and its been modded there a stadnyby switch and tehres this one switch that i dont know waht it does.
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Heres the link
/forum...d.php?t=121949
or you could have checked my website to.
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I plaed with the tubes the other night but i havent gotten a chance to play it yet. ITs been in the mid 90's tha last couple days and i have to play with my door shut and my neighbors dont like hearing it with my window open so I have to wait for it to cool down some before I can tell you guys if it worked.