jhollon
Rookie Solder Flinger
Posts: 21
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Post by jhollon on Jun 29, 2007 11:59:10 GMT -5
alright, as before listed in this post guitarnuts2.proboards45.com/index.cgi?board=wiring&action=display&thread=1154328757&page=1i was happy and everything was working fine. then after the guitar wasn't used for a week or so (traveling on business) i got home and plugged in. To my surprise a HUGE problem surfaced. the volume was low and as i let a string ring through my amp, as the signal faded (as usual) the signal oscillated and died and the guitar was silent. After i hit a couple of more notes, audio was again present, but the oscilation happens everytime now. I thought it was the battery, so i put a new tested one in and same thing. So i thought, maybe my amp was bad. I took it over to a neighbor's and tried two amps he had with the same result. Has anyone in here got ANY ideas on what this could be. I have done no work to the guitar after i got it working the first time. Any help would be great, i am losing my mind here.......
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Post by JohnH on Jun 29, 2007 15:28:02 GMT -5
Hi jh.. So after the first thread, did you get it going with the stereo jack for power etc? Also, could you describe a little more about the 'oscilation'. Is it a regular wavering of the sound? does ot cut in and out completely? or is it intermittent/iregular. Could it be a dodgy output jack or cable connection? - trying another guitar cord would be worthwhile.
cheers John
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jhollon
Rookie Solder Flinger
Posts: 21
Likes: 0
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Post by jhollon on Jun 29, 2007 15:35:36 GMT -5
the stereo jack worked fine, i have tried new cable and no go. the sound will be strong for a few seconds and then fade, then cut out, like if i don't use a pick, the sound will not come back. it is wierd.... I am going to try and record it and post it here or either email it to you. where and how can i get it out there on the forum or to you....
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jhollon
Rookie Solder Flinger
Posts: 21
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Post by jhollon on Jun 29, 2007 15:46:44 GMT -5
graphically it is kind of like,
pick )))))))))))))))))))))))))))))ooooooooo__________
everytime!!!!!
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Post by JohnH on Jun 29, 2007 16:35:44 GMT -5
the stereo jack worked fine, i have tried new cable and no go. the sound will be strong for a few seconds and then fade, then cut out, like if i don't use a pick, the sound will not come back. it is wierd.... I am going to try and record it and post it here or either email it to you. where and how can i get it out there on the forum or to you.... It would be best to host your sound on the net somewhere (such as soundclick, or anywhere you can place a file), and then post a link to it. That way others can hear it and we can all think about it. If you get stuck however, or just want to email it, theres a yahoo email address if you click on my profile. cheers John
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Post by ashcatlt on Jun 30, 2007 0:35:10 GMT -5
From what I'm reading I think you're saying that it kind of farts and then cuts out when things get quiet. Then you have to hit it really hard to get it to come back in. Is that right?
I'm no expert but it sounds to me like the theoretical symptoms of a mis-biased transistor/opamp. Assuming all of your solder connections are solid it's either a dying battery or a component on the board gone bad. Got a meter?
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Post by sumgai on Jun 30, 2007 3:17:53 GMT -5
Jeff, Minds found, while you wait! ;D If'n you got a battery, that's your most likely culprit. If not, then start checking solder joints. A transistor could go partially bad, but that usually happens while it's being abused, not when it's completely unpowered. If the circuit worked for a week, then any bias on the transistor(s) was/were very likely set correctly. I doubt that anything changed on the circuit board in a week of not being used. But solder joints....... now thems strange critters, they is. Re-heat everything, just to be sure, then re-test. HTH sumgai
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jhollon
Rookie Solder Flinger
Posts: 21
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Post by jhollon on Jul 2, 2007 8:53:07 GMT -5
figured it out. I resoldered everything without any change and noticed that if i jiggled the output jack it made the problem appear and disappear. So i opened the jack and resoldered it without change. I then bent the jack connectors so they made a tighter connection and that was the ultimate fix. With that fixed I now found a new problem with my blues junior amp. It is making the same noise i spoke about earlier. I made sure to let the tubes warm up, but it still makes the same fart and then drop in volume. The problems were unrelated it seems. Anyone got any ideas on what the amp problem could be? the output jack must have been making good contact when plugged into the amp when i tried it everytime and maybe out other times. Now amp seems to be the issue..........
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