I have no idea what it is. There are no visible burns or loose components anywhere.
Identifying what that brown blob of coil is would let me find one and replace it.
Thanks for looking!
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Avoustic 370 nasty noise
- Thread starter Psyconoodler
- Start date
I have no idea what it is. There are no visible burns or loose components anywhere.
Identifying what that brown blob of coil is would let me find one and replace it.
Thanks for looking!
I'd suggest having as set of schematics before assuming anything about components.
- Feb 16, 2008
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- John K Custom Basses
that inductor shouldn't be causing the noise. rather it may make one of the eq sliders or the midrange pot not work depending on which one it is.
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There are others like it and they don't look burnt. They have values om the back. This one looks like domeone repaired it at some
Looks like it was repaired snd it is indeed burnt cause the other ones on the board don't look like this one
- Feb 16, 2008
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- John K Custom Basses
that part was discontinued more than 20 years ago. it was made by artted. I have tried to locate and acquire them for the last 10 years but to avail. i have the schematic to the amp and made pedal versions of the preamp and poweramp.
if you take a picture of the whole circuit board and show it's location i can tell you what value of inductor it is.
- Feb 12, 2006
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- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
The inductor is almost certainly not the cause of the noise.
It's an inductor in the EQ
Highly doubt it's the problem. Search electronic forums for how to measure them.
Any idea where to go first to find the cause of this nasty noise? It's as soon as it's turned on. Nothing plugged in
- Feb 16, 2008
- 21,240
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- John K Custom Basses
'nasty noise' is a vague description, so, for me, there's no way that i could diagnose your problem.
Sounds like something best diagnosed in person by a tech with experience handling that model of amp.
Now that you say it, it does look someone did some surgery to reattach the coil leads to the solder post and put some RTV on them to hold things in place.
That said the noise issue is most likely caused by something else.
What is the noise, hum, hiss, snapping and popping?
A very small part of electronics troubleshooting is visual; most of the time it's of 0% value. The most likely responses will end up being "take it to a tech" because there's no way even the best of amp techs can tell you what's wrong by your description. It's the equivalent to asking your mechanic about your car is running rough and it has several new scratches & door dings; what could it be? He'd tell you to bring it in. If he guessed at the problem, he would probably also say it could be any of a dozen things. It could probably be three dozen things causing noise in your amp. A tech can eliminate a large number of those in a few minutes and start closing in on the cause……if he has the amp, but probably can't eliminate any by reading your post & viewing the pics.
Not intended as an insult, but if you aren't able to identify the components on a circuit board, you might be over your head in attempting a repair. I had many years of electronic repair in the military and I won't touch my gear anymore. I made the mistake of trying and failing to repair an old TV, only to bring it to someone that did TV repair before he joined the service. He let me know that the tv was in a condition that made it unsafe for even an experienced technician to work on and that I was lucky I didn't electrocute myself. He refused to fix it and showed me where an insane voltage was being generated. Probably 10 times what should have been there.
Life is short. Why make it shorter.
Life is short. Why make it shorter.
I agree. I see a lot of bands and their amps were working perfectly and that "vague description/nasty noise" was present through the whole night.
You in back! No, it's not time to fire the drummer again!
Just tossing this out there... you're probably looking at one or more of:
- dry capacitors needing replacement
- broken/intermittent connections
- potentiometers and switches needing significant internal cleaning and/or replacement
- Power supply (huge capacitors, diodes, transformer(s)) with issues due to sitting around...
so yea there's a lot to test. and testing and experience knowing what and how to test are the main thing to do at this stage... you could learn, but it's a lot of learning.... and time... and possible user error
- dry capacitors needing replacement
- broken/intermittent connections
- potentiometers and switches needing significant internal cleaning and/or replacement
- Power supply (huge capacitors, diodes, transformer(s)) with issues due to sitting around...
so yea there's a lot to test. and testing and experience knowing what and how to test are the main thing to do at this stage... you could learn, but it's a lot of learning.... and time... and possible user error
