Is my amp done for? - Jemsite
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post #1 of 60 (permalink) Old 07-02-2007, 10:17 AM Thread Starter
 
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Is my amp done for?

I let a buddy borrow my head and cab and when he returned it I hooked it with the cable going into the 4 ohms input on the cab, but i didnt notice that he had switched the amp impedance on the head to 16 ohms. so after unknowingly playing with the amp impedance set at 16 ohms going into the 4 ohms channel on the cab for weeks, my amp just cut out in the middle of practice yesterday and now it wont turn back on at all.

Is this thing fried? I dont know the first thing about trying to fix a situation like this so any insight and help is appreciated
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post #2 of 60 (permalink) Old 07-02-2007, 10:20 AM
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Re: Is my amp done for?

Take it to a tech and give your buddy the bill.
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post #3 of 60 (permalink) Old 07-02-2007, 10:25 AM
 
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Re: Is my amp done for?

Yeah, I'm pretty sure you fry your head when you do that. I've never done it, so don't quote me, though.
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post #4 of 60 (permalink) Old 07-02-2007, 10:27 AM
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Re: Is my amp done for?

A good clue that its damaged is that it doesnt work now. Nine times out of ten that means take it to get looked at.
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post #5 of 60 (permalink) Old 07-02-2007, 10:28 AM
 
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Re: Is my amp done for?

Did you get the blue smoke?
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post #6 of 60 (permalink) Old 07-02-2007, 10:53 AM
 
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Re: Is my amp done for?

It's most likely damaged.

The most you should ever deviate is 2x the head output, and even then it's not such a good idea, so 4 into 8 would've probably been okay.

When you run low out into a higher setting, you can set up a situation where flyback voltages are created. It not only can fry your output xfrmer, it can damage components as well.

Good luck...
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post #7 of 60 (permalink) Old 07-02-2007, 10:53 AM
 
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Re: Is my amp done for?

What kind of amp is it? If it has a fuse in the back, the fuse could be blown, hence why it won't turn on. If it turns on but there's no sound, check the tubes.

Jimmy
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post #8 of 60 (permalink) Old 07-02-2007, 11:26 AM
 
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Re: Is my amp done for?

That's why I never let people to use my things, if anything happens it'll be hard to ask him to pay. He wants to play the guitar but doesn't have an amp
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post #9 of 60 (permalink) Old 07-02-2007, 11:34 AM Thread Starter
 
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Re: Is my amp done for?

Quote:
Originally Posted by Thwap View Post
It's most likely damaged.

The most you should ever deviate is 2x the head output, and even then it's not such a good idea, so 4 into 8 would've probably been okay.

When you run low out into a higher setting, you can set up a situation where flyback voltages are created. It not only can fry your output xfrmer, it can damage components as well.

Good luck...
thanks for the info, then its probably thats what i feared, any idea if this is salvagable and how much it might cost?
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post #10 of 60 (permalink) Old 07-02-2007, 11:49 AM
 
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Re: Is my amp done for?

Well, I've seen fuse and one diode replacements (total of $2.00 in parts) charged out at over $50.

So you're gonna have to pay for...diagnostics, labor, and parts.

So depending on what it is...lets assume transformer...probably 350-450.

That's a guess obviously.
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post #11 of 60 (permalink) Old 07-02-2007, 12:02 PM
 
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Re: Is my amp done for?

Here, read this...... it's pretty simple to understand.

http://www.legendarytones.com/ohms.html

Look, with all the "information" you've received..... don't jump to conclusions! Hopefully you've only blown a fuse. Anyway, I wouldn't take any of this as "gospel"!

Besides, now you want everyone to troubleshoot it and give you a "ballpark" price to fix it? You don't even know what problems you have yet!

We have no info on the amp (brand, tube or solid state, wattage)..... again, take it to a amp tech, not a guitar forum for diagnoses! You'll get facts not opinions!
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post #12 of 60 (permalink) Old 07-02-2007, 12:03 PM
 
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Re: Is my amp done for?

Quote:
Originally Posted by Thwap View Post
Well, I've seen fuse and one diode replacements (total of $2.00 in parts) charged out at over $50.

So you're gonna have to pay for...diagnostics, labor, and parts.

So depending on what it is...lets assume transformer...probably 350-450.

That's a guess obviously.
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post #13 of 60 (permalink) Old 07-02-2007, 12:04 PM
 
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Re: Is my amp done for?

Quote:
Originally Posted by jemplayer55 View Post
Here, read this...... it's pretty simple to understand.

http://www.legendarytones.com/ohms.html

Look, with all the "information" you've received..... don't jump to conclusions! Hopefully you've only blown a fuse. Anyway, I wouldn't take any of this as "gospel"!

Besides, now you want everyone to troubleshoot it and give you a "ballpark" price to fix it? You don't even know what problems you have yet!

We have no info on the amp (brand, tube or solid state, wattage)..... again, take it to a amp tech, not a guitar forum for diagnoses! You'll get facts not opinions!
True dat.
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post #14 of 60 (permalink) Old 07-02-2007, 12:21 PM
 
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Re: Is my amp done for?

P.S...... don't loan out anything to that @sshole again! Besides, you didn't notice a difference?

Moral to story:

Always check your equipment before throwing the first "ON" switch!

Or how about this.... If you can't afford another don't loan out the first one!
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post #15 of 60 (permalink) Old 07-02-2007, 12:34 PM
 
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Re: Is my amp done for?

Well, the bottom line is that you can diagnose simple problems with an amp, like pulling the amp out of its enclosure to see if the tubes blew (provided that it's a tube amp. If the amp has a fuse holder in the back panel, you can pull the fuse out and see if it's bad (again, provided that you have an amp that has such a feature). If neither of those work, then the problem is more involved and will definitely require a qualified technician to diagnose the problem and estimate a cost for repairs.

As i stated before, please post more information about your amp and cab (i,e. brand, type of amp, etc.). I agree with Jemplayer about loaning out things to people. Unfortunately, people will never treat something of yours with the same care you would because it's not theirs. As far as checking everything when it comes back to you, that should be a must especially with a head and cab.

Jimmy
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