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Post subject: WEIRD PROBLEM
Posted: Sun Oct 05, 2008 1:27 pm
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Hey everyone new to the forum. I have a really odd problem. I just bought a classic 60's player strat which i LOVE and am playing it through a blues junior. It is tuned to eb. Now in all pickup positions except the bridge position here's what happes: Plays fine - UNLESS I hit 6th string G on 3rd fret, fifth string G on 10th fret and fourth string G on 5th fret. When I do that the amp cuts out and makes a weird crackle cut out noise. I'm praying someone has heard of something like this or can help. Thanks, Steve. (please don't say don't play those notes and you'll be all set)


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Posted: Sun Oct 05, 2008 1:56 pm
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Wow, never heard of that problem. I'll keep watching this subject in case someone else has. Don't want that to happen to me. Have you checked your wiring on the guitar or cables your playing through?

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Post subject: Re: WEIRD PROBLEM
Posted: Sun Oct 05, 2008 2:01 pm
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everything seems to be fine cable wise and pickup wiring wise it's just that frequency is doing something to the amp. which leads me to think its an amp problem more than anything but i don't know


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Post subject: Re: WEIRD PROBLEM
Posted: Sun Oct 05, 2008 2:25 pm
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storge67 wrote:
which leads me to think its an amp problem


I agree.

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Post subject: Re: WEIRD PROBLEM
Posted: Sun Oct 05, 2008 2:29 pm
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storge67 wrote:
Hey everyone new to the forum. I have a really odd problem. I just bought a classic 60's player strat which i LOVE and am playing it through a blues junior. It is tuned to eb. Now in all pickup positions except the bridge position here's what happes: Plays fine - UNLESS I hit 6th string G on 3rd fret, fifth string G on 10th fret and fourth string G on 5th fret. When I do that the amp cuts out and makes a weird crackle cut out noise. I'm praying someone has heard of something like this or can help. Thanks, Steve. (please don't say don't play those notes and you'll be all set)


Patient: Hey doc, it hurts when I do this

Doc: Then don't do that anymore

:lol:

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Posted: Sun Oct 05, 2008 2:33 pm
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Ok i've had experience of this. You've got a cracked joint in the amp somewhere. You will never spot it either, it could be in a million places. The cracked joint is'nt too bad at the moment but it will get worse.
The reason it happens is because the speaker vibrates differently for different notes. Certain notes are causing vibrations that cause the joint play up.

Good amp tech will sort it, dont try it yourself. the valve circuit can carry 30,000 volts even when its switched and off unplugged.

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Post subject: Re: WEIRD PROBLEM
Posted: Sun Oct 05, 2008 2:35 pm
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Post subject:
Posted: Sun Oct 05, 2008 2:40 pm
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nikininja wrote:
Ok i've had experience of this. You've got a cracked joint in the amp somewhere. You will never spot it either, it could be in a million places. The cracked joint is'nt too bad at the moment but it will get worse.
The reason it happens is because the speaker vibrates differently for different notes. Certain notes are causing vibrations that cause the joint play up.

Good amp tech will sort it, dont try it yourself. the valve circuit can carry 30,000 volts even when its switched and off unplugged.


I've been bit by that kinda voltage repairing an O'scope once. It definately hurts. You're right though. It sound like a some solder needs to be reflowed.

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Posted: Sun Oct 05, 2008 3:49 pm
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nikininja wrote:
Ok i've had experience of this. You've got a cracked joint in the amp somewhere. You will never spot it either, it could be in a million places. The cracked joint is'nt too bad at the moment but it will get worse.
The reason it happens is because the speaker vibrates differently for different notes. Certain notes are causing vibrations that cause the joint play up.

Good amp tech will sort it, dont try it yourself. the valve circuit can carry 30,000 volts even when its switched and off unplugged.


Ok, thanks a lot for the help, I appreciate it!!!


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Posted: Mon Oct 06, 2008 3:51 pm
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storge67 wrote:
nikininja wrote:
Ok i've had experience of this. You've got a cracked joint in the amp somewhere. You will never spot it either, it could be in a million places. The cracked joint is'nt too bad at the moment but it will get worse.
The reason it happens is because the speaker vibrates differently for different notes. Certain notes are causing vibrations that cause the joint play up.

Good amp tech will sort it, dont try it yourself. the valve circuit can carry 30,000 volts even when its switched and off unplugged.


Ok, thanks a lot for the help, I appreciate it!!!


ALL. Does that help anyone?


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Posted: Mon Oct 06, 2008 5:16 pm
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are you ok testing for dry joints in your circuit board, im 98% certain thats what the problem is. try changing a pre amp valve or two around with ones from different possitions if you want, see if you get any different results. If not its a circuitboard solder repair.

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Posted: Mon Oct 06, 2008 5:51 pm
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nikininja wrote:
Ok i've had experience of this. You've got a cracked joint in the amp somewhere. You will never spot it either, it could be in a million places. The cracked joint is'nt too bad at the moment but it will get worse.
The reason it happens is because the speaker vibrates differently for different notes. Certain notes are causing vibrations that cause the joint play up.

Good amp tech will sort it, dont try it yourself. the valve circuit can carry 30,000 volts even when its switched and off unplugged.


I'm sure that's the one.

I've heard a guy from the Marshall factory talking about this very issue, with the cause that Niki says. Stress fractures caused by repeated heating and cooling, sometimes associated with vibration at a particular frequency. The same thing sometimes brings down airliners.

He said it can sometimes be nightmarishly difficult to trace the cause: if they can't find it within reasonable time they eliminate as many places as possible, hunt it to a general area and then just replace that PCB, if possible.

Unless you really know what you are doing this is not a DIY repair. Very dangerous. Take it to a qualified tech.

Cheers - C


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Post subject:
Posted: Mon Oct 06, 2008 6:00 pm
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Get it checked out by a guitar docter! :lol:

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Posted: Tue Oct 07, 2008 2:28 pm
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probably you have the bridge pickup really really extremelly high? :P


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Posted: Tue Oct 07, 2008 2:58 pm
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