bill2455
First Lieutenant   Posts: 3 Registered: 3/11/2004 Status: Offline
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posted on 3/11/2004 at 20:53 |
I'm new to the forum, new to guitars and amps and I don't even play but my
son does and he's been playing for 3 years and we seem to have a feedback
problem.
Here's some background We've just gotten a Marshall MG100HDFX head and I'm
putting together two single cabinets with some Peavey 15" Black Widow
speakers I've picked up. He has a Dean 7 string with dual humbuckers, a
Univox Les Paul knockoff and a Jay Turser 5 string bass.
He used to use a Peavey Studio Pro 50 and the feedback issue was always
there a little bit but not nearly as bad as it seems to be now. When using
either of his electric guitars in the Marshall while playing clean
everything seems to be fine (no feedback issues). While in distortion we
have a big problem. You can just set his guitar down and the noise will
just start to build all on its own with nobody near it, the strings start
to vibrate on their own and you can press lightly on the string and the
noise will stop and then slowly start again, it could be the same string or
another one.
Is this feedback ? How do I fix this ?
I've potted the pickups in his Univox to no avail, re-routed his grounding
a couple of times again in the Univox (I don't want to mess with his 7
string until I have a fix if possible), bought a $40 patch cord, searched
the internet, asked a couple of friends .....
I really don't want to have pay anyone to fix this for us (if we really do
have a problem). My son is 14 and really keen on learnig as much as he can
so he can be his own techy. I'd like to help but I've run out of ideas, any
help would be greatly appreciated.
I hope I didn't ramble too much for my first post.
bill2455
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brian
Moderator   Posts: 1042 Registered: 12/22/2003 Status: Offline |
posted on 3/11/2004 at 21:36, Reply 1 |
Hey Bill,
Welcome to the forums.....
How close is your son playing from the marshall?
When you set the guitar down are you turning the volume down?
If not any guitar will do feedback like your talking about.
If you have the volume cranked and playing in a small room this will happen
as the sound waves are just bouncing like crazy....
Does the feedback start with a deep rouring sound???
Let us know
Thanks
Brian
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Guitar101
Moderator  Posts: 461 Registered: 12/22/2003 Status: Offline |
 posted on 3/11/2004 at 21:40, Reply 2 |
How are the tubes,
Are they microphonic
Do you have the reverb cranked
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bill2455
First Lieutenant Posts: 3 Registered: 3/11/2004 Status: Offline |
posted on 3/12/2004 at 06:33, Reply 3 |
HI guys;
Thanks for the replys.
We are in a small room right now, maybe we'll try the livingroom tonight.
The feedback starts as a small sound and continually builds. His amp is a
new solidstate from Marshall, and no effects enabled. His friends Ibanez is
fairly quiet in the same room on the same gear.
Will shielding maybe help ?
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Guitar101
Moderator Posts: 461 Registered: 12/22/2003 Status: Offline |
posted on 3/12/2004 at 10:52, Reply 4 |
It could be cheap pickups????
Does this feedback happen while your playing or when you stop?
Or Both?
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bill2455
First Lieutenant Posts: 3 Registered: 3/11/2004 Status: Offline |
posted on 3/12/2004 at 17:08, Reply 5 |
It happens both when he's playing and not playing, now that I've listening
for it. It could be the pickups, I've had them out of both guitars and
theres no brand name on either set. Maybe I should try potting the 7 string
pickups and see what happens.
Does anyone know whether shielding might help ?
Thanx
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brian
Moderator Posts: 1042 Registered: 12/22/2003 Status: Offline |
posted on 3/13/2004 at 22:06, Reply 6 |
Sounds like grounding Problem. Maybe a ground loop!
Brian 
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Telefreak
Moderator  Posts: 440 Registered: 1/12/2004 Status: Offline |
posted on 3/14/2004 at 19:57, Reply 7 |
Sounds to me like too much distortion, too much volume and too close to the
amp.
If he moves away from the amop and turns the distortion and/or volume down,
it will be ok ____________________
Technology, not technique
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