#1
Today I was messing around inside my head, to make sure everything is alright in there and see if my pamp tube is ready for a replacement, because it has been sounding like it. So I take off the back plate so I can see the tube, and it's looking pretty ready for a new one.

Thats cool with me, so I start unplugging everything (after it's off of course) and as i'm unplugging my instrument cable connecting the head and the cabinet to each other one of the sides of the instrument cable falls inside of the head, falling what seemed to be near where the power cable is inserted at. The moment it falls in there a crazy blue light and mini jolt happens inside and then something smells burnt.

Once I collect my "Oh Sh**!" thoughts I try and see if I can see anything damaged and I can't, although I gave myself a huge shock in the process. So I turn the amp on and it still turned on, so I thank god and move on.

However, now it's not. Help?
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#3
yeahhh i'd say its busted.. take that to an amp specialist, idk if a luthier can help you out with that. is the instrument jack still in the amp?
wut.
#4
Yes I unplugged it first, meaning the head. The head was completely off.

@Reptilianriff could you maybe explain how your sure it's busted?

I'd really like to figure out what exactly I did to it, because I was about to sell it.
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#6
your description is really kinda vague..

first of all, don't use an instrument cable to connect the head to the cab.. use a speaker cable.

as for what's wrong, it sounds like you shorted some high voltage from the power supply to a component and fried that component.

take it to a tech if you don't know what youre doing though, or if you don't know how to find out what you shorted
#7
Quote by james4
your description is really kinda vague..

first of all, don't use an instrument cable to connect the head to the cab.. use a speaker cable.

as for what's wrong, it sounds like you shorted some high voltage from the power supply to a component and fried that component.

take it to a tech if you don't know what youre doing though, or if you don't know how to find out what you shorted


Yeah I know I should be using a speaker cable, but it's all I got atm.

I'd really like to check and see which component is fried myself, to be more aware of my equipment. Do you know of some type of guide I could go by to safely check my components?
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#8
Bump.
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#9
A) speaker cable, as noted

B) bumping after only an hour, especially in a thread this slow moving is pointless and annoying.

C) Was the amp unplugged from the wall?

D) If it was, it sounds like you shorted a cap, or the transformer, do you know what you dropped it on, or do you have a guess?

E) it sounds like you left the amp on, then it turned itself off? Will it turn on again?

F) Do you have another head you can test the speaker cab with? You may have damaged the speakers.

G) Do you see anything that looks burnt, or smell something that may be burning?


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RBY CYOA
#10
Quote by MonkeyLink07
A) speaker cable, as noted

B) bumping after only an hour, especially in a thread this slow moving is pointless and annoying.

C) Was the amp unplugged from the wall?

D) If it was, it sounds like you shorted a cap, or the transformer, do you know what you dropped it on, or do you have a guess?

E) it sounds like you left the amp on, then it turned itself off? Will it turn on again?

F) Do you have another head you can test the speaker cab with? You may have damaged the speakers.

G) Do you see anything that looks burnt, or smell something that may be burning?



A. Yeah, I know but thanks.

B. Sorry, It's kind of important.

C. No, but it was off.

D. I am not completely sure what I dropped it on, but it was near the power cable input.

E. No the amp was off, but when I turned it on again to see the damage it seemed fine, however when I tried again a couple minutes later it wouldn't turn on and has since been like that.

F. No, unfortunately.

G. At first something burned, but obviously stopped once I got the cable out of there.

I've been trying to figure out what part burnt.
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#11
Did you turn the amp on while the cab was disconnected from the head?
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#12
Quote by WinterSteel
Did you turn the amp on while the cab was disconnected from the head?


lol, no. I already know not to do that.
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#13
Quote by Funk Monk
lol, no. I already know not to do that.


Haha, oh good. Just checking.
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#14
I might be able to help, but you'll have to answer some questions:

1. What is your amp?

2. Have you checked the fuse(s)?

3. Can you take a picture near where you think the short occurred?
#15
Quote by end_citizen
I might be able to help, but you'll have to answer some questions:

1. What is your amp?

2. Have you checked the fuse(s)?

3. Can you take a picture near where you think the short occurred?



Awesome.

1. Marshall AVT 50h

2. I have, but nothing looks damaged.

3. I will try, but my laptop has really shi*ty quality. The short happened near the power cable input.

EDIT: I can't find a fuse in this amp. Do Solid States/Hybrids even have one?
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Last edited by Funk Monk at Sep 16, 2010,
#17
If you don't see a fuse on the back panel they may be located inside. It would be obvious if it's blown. A solid state amp rules out voltage caps. A short is when you have a positive touching a negative (you may already know this).
From what I'm understanding is that the jack came loose and fell inside?
Probably bridging something. Have you looked at both sides of the PCB? you want to check the components as well as the traces on the board.
#18
Finally found the fuse, and it's been blown. Not too bad however, and damn this thing is small. Where can I find a new one of these at?

EDIT: Cool I think I figured everything out, thanks guys.
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Last edited by Funk Monk at Sep 16, 2010,
#19
a hardware store should have one. if you want to get super picky, some high end audio places sell fancy more expensive ones, but.. you'll be fine with one from the hardware store. just make sure you match the numbers
#20
Quote by james4
a hardware store should have one. if you want to get super picky, some high end audio places sell fancy more expensive ones, but.. you'll be fine with one from the hardware store. just make sure you match the numbers


Well, I found A250vac on the fuse. Does that make sense?

Cool, how much do you think it will be?
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#21
That is just the voltage rating. There should be a current rating as well. Something like 1A, 2A, etc. That's what will be necessary.

Fuses should be like $3-$5 for a pack of 5.

While you're at the store, pick up a real speaker cable. You can do some serious damage to yourself using that instrument cable.

A friend asked me to look at his amp, so I grabbed a guitar to see what was going on. I touch the strings and get shocked because the cable couldn't handle the current and shorted to ground. He "fixed" the fuse blowing problem with some aluminum foil.
Last edited by end_citizen at Sep 16, 2010,
#22
Quote by end_citizen
That is just the voltage rating. There should be a current rating as well. Something like 1A, 2A, etc. That's what will be necessary.

Fuses should be like $3-$5 for a pack of 5.

While you're at the store, pick up a real speaker cable. You can do some serious damage to yourself using that instrument cable.

A friend asked me to look at his amp, so I grabbed a guitar to see what was going on. I touch the strings and get shocked because the cable couldn't handle the current at shorted to ground. He "fixed" the fuse blowing problem with some aluminum foil.


Yeah i'm investing in a real speaker cable, but i'm having trouble finding a gold plated one under 3 ft. even 1ft. would be long I would really prefer something shorter.

I believe I found the value, which is 1.6A
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#24
It doesn't need to be, I'm looking for good quality and I kinda like the look of gold plated cables.
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#25
gold is softer and can wear faster. I imagine your not going to be pulling speaker cables in and out so it won't be that much of a problem.

there's a bunch here
http://instruments.shop.ebay.com/Musical-Instruments-/619/i.html?_trkparms=65%253A12%257C66%253A2%257C39%253A1%257C72%253A4026&rt=nc&_nkw=gold+speaker+cable&_catref=1&_sticky=1&_trksid=p3286.c0.m14&_sop=15&_sc=1
#26
I honestly cannot tell the difference between Gold plated, and nickel.
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#29
Quote by vvvan
you burn it

Get out of GB&C.
If you're not going to contribute, the virtual door is right over there.
That way------->

EDIT: I'm reporting your post. That's your third spam post I've seen today. 2 of them were in threads which you made.
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Last edited by timbit2006 at Sep 16, 2010,
#30
I'd be more concerned about the gauge of the wire than the gold plating. "Looking better" should make no difference for something plugged into the back of your amp.

Good luck with the fuse.