#1
Im trying to find out whats wrong with my amp, it makes a noise that sound like a wind is blowing , no guitar is plugged in, at half volume it start to get annoying and at full volume it sounds like a big fan inside the amp

What i now so far, is that their isnt anything wrong with the tubes at all, and there is not any of the electronical equipment in this apartment that cause it ( tv, comp )

Ive tried all outlets in the apartment and it sounds the same on all

there is a sound sample in the profile
Inspired by Ibanez RGA321F Prestige, Gibson Les Paul Standard
Powered by CAA OD100 standard+ , Mesa 2x12
Affected by Maxon OD808, Mad Professor Deep blue delay


Last edited by Jaekae at Dec 5, 2008,
#2
Quote by Jaekae
Im trying to find out whats wrong with my amp, it makes a noise that sound like a wind is blowing , no guitar is plugged in, at half volume it start to get annoying and at full volume it sounds like a big fan inside the amp

What i now so far, is that their isnt anything wrong with the tubes at all, and there is not any of the electronical equipment in this apartment that cause it ( tv, comp )

Ive tried all outlets in the apartment and it sounds the same on all

there is a sound sample in the profile
It may need to be biased. Is it a new amp?
Scarred for life!

Rig:
Gibson LPC
Jackson DK10D
Fender HM Strat
Custom built Tele-type
Alvarez 5040 Koa
Epiphone 12 string
Blue Voodoo 50
Dunlop 213 slide
Fender M-80 chorus
Digitech Jimi Hendrix Experience
#3
Quote by damskippy
It may need to be biased. Is it a new amp?


it was a demo ex at the store, the noise isnt noticeable at low volumes
Inspired by Ibanez RGA321F Prestige, Gibson Les Paul Standard
Powered by CAA OD100 standard+ , Mesa 2x12
Affected by Maxon OD808, Mad Professor Deep blue delay


#4
What brand? How do you know there's nothing wrong with the tubes. Is it two channel? if so does it make the noise on clean and drive or just one?
Scarred for life!

Rig:
Gibson LPC
Jackson DK10D
Fender HM Strat
Custom built Tele-type
Alvarez 5040 Koa
Epiphone 12 string
Blue Voodoo 50
Dunlop 213 slide
Fender M-80 chorus
Digitech Jimi Hendrix Experience
#5
just sounds like gain is maxxed out and it does make that noise...
=BROLY - HIS POWER IS MAXIMUM=
#6
Quote by damskippy
What brand? How do you know there's nothing wrong with the tubes. Is it two channel? if so does it make the noise on clean and drive or just one?


its a engl screamer, its 4 channels, and its there on all except the clean

because i have tried with new tubes and it sounds the same

i have asked 3 ppl with this amp and they say they dont get this sound
Inspired by Ibanez RGA321F Prestige, Gibson Les Paul Standard
Powered by CAA OD100 standard+ , Mesa 2x12
Affected by Maxon OD808, Mad Professor Deep blue delay


#7
Quote by Jaekae
its a engl screamer, its 4 channels, and its there on all except the clean

because i have tried with new tubes and it sounds the same

i have asked 3 ppl with this amp and they say they dont get this sound
Even if you went back with the same tubes you may need to bias the amp. Pretty straight forward service. But you'll probably want to let someone who knows what they're doing to perform the procedure. Sounds like you've already done all you can do, and seing how the clean side is good ,it all boils down to the drive tubes doesn't it. Check out the specs and make sure the proper tubes are in the amp, but other than that I don't see any alternative. Besides that, a tech can isolate the problem if it's not the bias of the amp.
Scarred for life!

Rig:
Gibson LPC
Jackson DK10D
Fender HM Strat
Custom built Tele-type
Alvarez 5040 Koa
Epiphone 12 string
Blue Voodoo 50
Dunlop 213 slide
Fender M-80 chorus
Digitech Jimi Hendrix Experience
#8
think ill try to clean the tube slots with some contact cleaner and make sure its 100% correct biased,

btw are you sure that a bias problem can cause this kind off noise?
Inspired by Ibanez RGA321F Prestige, Gibson Les Paul Standard
Powered by CAA OD100 standard+ , Mesa 2x12
Affected by Maxon OD808, Mad Professor Deep blue delay


#9
Quote by Jaekae
think ill try to clean the tube slots with some contact cleaner and make sure its 100% correct biased,

btw are you sure that a bias problem can cause this kind off noise?
That sounds like a good idea. No, I'm not but it's a cheap fix and that's the best place to start. I've been fortunate with my Blue Voodoo, it's been a real trooper.
Scarred for life!

Rig:
Gibson LPC
Jackson DK10D
Fender HM Strat
Custom built Tele-type
Alvarez 5040 Koa
Epiphone 12 string
Blue Voodoo 50
Dunlop 213 slide
Fender M-80 chorus
Digitech Jimi Hendrix Experience
#10
Based on the description of the problem, being that it's present on all but one channel, it's isolated to the preamp section (so you don't need to bias it). Most multichannel amps use one fewer gain stage on the clean channel, usually the V1 preamp tube. Get yourself an ultra-low-noise 12AX7 variant for the V1 position and it should clear up a bit. JJ and Tung Sol have new production tubes that work perfect for this.
ESP LTD EC-256 and a Fender Deluxe VM
#11
i just changed the preamp tubes today, v1 got a new JJ v2 a new tung sol and v3 a JJ and v4 phase inverter is a JAN 12AT7 , and i payed extra to get them tested to be low noise,

EDIT: Tried cleaning preamp tube sockets, didnt help at all,
and noticed that i forgot to up the clean channels gain when i tried before, so now i noticed its present on all channels,

so im gonna try to clean the power amp sockets now
Inspired by Ibanez RGA321F Prestige, Gibson Les Paul Standard
Powered by CAA OD100 standard+ , Mesa 2x12
Affected by Maxon OD808, Mad Professor Deep blue delay


Last edited by Jaekae at Dec 5, 2008,
#12
arent there any amp techs on this site?
Inspired by Ibanez RGA321F Prestige, Gibson Les Paul Standard
Powered by CAA OD100 standard+ , Mesa 2x12
Affected by Maxon OD808, Mad Professor Deep blue delay