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Post subject: Twin Reverb W/T blown fuse
Posted: Sat Oct 10, 2015 4:38 pm
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Hi all, we have a Twin Reverb (2013) with less than 40 hours on it . Last night it blew the fuse. Since fuses blow for a reason I thought I would ask some questions befor I just replace it. We have had several power interruptions in the last week. is it possible for a voltage spike to blow the fuse? If there is an internal problem will replacing the fuse make it worse? What is the basic diagnostic chain, where should I start from most common to least? I If I can't ID the problem and have to take it for repair I want to be informed about the issue.


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Sat Oct 10, 2015 7:22 pm
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Eroot64 wrote:
Hi all, we have a Twin Reverb (2013) with less than 40 hours on it . Last night it blew the fuse. Since fuses blow for a reason I thought I would ask some questions befor I just replace it. We have had several power interruptions in the last week. is it possible for a voltage spike to blow the fuse? If there is an internal problem will replacing the fuse make it worse? What is the basic diagnostic chain, where should I start from most common to least? I If I can't ID the problem and have to take it for repair I want to be informed about the issue.
Hi Eroot64. I'm sure one of our resident amp experts will chime in very shortly but in the mean while perhaps this recent experience with a blown fuse on my Blues Jr. will be relevant. It turned out to be the power tubes. I changed them for an identical pair and the amp was good to go. Of course it could also just be the fuse and they can go even with only 40 hours of play time. For about 17 cents a pop I think it would be worthwhile to change it and see if it blows again. If it does then maybe look at the tubes.

Disclaimer: I'm no expert nor do I play one on the Internet and what applies to the Blues Jr. may not to your Twin.

HTH

Cheers!
BM

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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Sat Oct 10, 2015 8:56 pm
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Thanks for your reply BM. I think you may be correct about the tubes. It would be great if it was just the fuse.


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Sun Oct 11, 2015 1:54 am
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Be sure correct fuse is being used.

How old are the tubes? What type & brand are they?


Thanks!


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Sun Oct 11, 2015 7:03 am
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Eroot64 wrote:
Hi all, we have a Twin Reverb (2013) with less than 40 hours on it . Last night it blew the fuse. Since fuses blow for a reason I thought I would ask some questions befor I just replace it. We have had several power interruptions in the last week. is it possible for a voltage spike to blow the fuse?
Yes

If there is an internal problem will replacing the fuse make it worse? What is the basic diagnostic chain, where should I start from most common to least? I If I can't ID the problem and have to take it for repair I want to be informed about the issue.


Try new fuse , same type .
If it blow , remove all output tubes , try again with new fuse. If fuse don't blow , one or more output tubes are short .


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Sun Oct 11, 2015 8:04 am
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While an old fuse may fail for no apparent reason, the slow blow fuses in a new amp are going to be very reliable.
Your fuse probably blew for a good reason.
As previously described, its probably a power tube.
If the cathode shorts to the filament, it creates a short to ground in the filament circuit and overloads the fuse.
If pulling the power tubes doesn't prevent the fuse from blowing, there is a deeper failure in the power supply.


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Sun Oct 11, 2015 1:29 pm
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Thanks for all the valuable advice, I will take the steps you all recommend and see how it go's.
P.S. everything in the amp is bone stock.


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Wed Oct 14, 2015 9:49 pm
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Hi guys I have an update and ask where to go from here. I replace the new fuse and nothing, no light, zip. fuse remains good. Could this still be tubes? Seems like the amp should come on and blow the fuse. ???


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Thu Oct 15, 2015 12:46 am
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Eroot64 wrote:
Hi guys I have an update and ask where to go from here. I replace the new fuse and nothing, no light, zip. fuse remains good. Could this still be tubes? Seems like the amp should come on and blow the fuse. ???



No front Panel light ? Fuse are burn or wall outlet are not working or power Transformer are burn .

Check your fuse with a meter , not with your eyes


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Thu Oct 15, 2015 8:31 am
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If the fuse is good, then you should be able to measure continuity through the 2 prongs of the AC plug when the power switch is ON.
At this point, my guess is that the fuse blew when the primary of the power transformer shorted. Now the winding is open and nothing happens.
So I would expect no continuity across the AC plug.
If you don't have a meter, in this case, you can measure continuity with a 9volt battery across the prongs of the AC plug. Turn the power switch on and In dim light, you can see minor sparks when you touch the battery contacts to the plug when there is continuity.
If its open, there will be no sparking.
There could be other problems causing an open circuit, but most of those won't blow a fuse first.


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Thu Oct 15, 2015 4:09 pm
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TimsAudio always has good advice. If this is the case, the transformer at fault, I would defiantly follow Fender's procedures to request warranty repair on this product. I think for amps it's a 5 year warranty.


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Fri Oct 16, 2015 12:52 am
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jackhammer wrote:
TimsAudio always has good advice. If this is the case, the transformer at fault, I .


Yes Tim is very helpfull

Before Tim, stratele52 had already written;

No front Panel light ? Fuse are burn or wall outlet are not working or power Transformer are burn .

Check your fuse with a meter , not with your eyes


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Fri Oct 16, 2015 2:33 pm
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Thanks to everyone! I thought the transformer may be the issue.
We got this amp from the original owner and have the original receipt. Can we still use the warranty? Is it transferable?


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Tue Oct 27, 2015 6:51 pm
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Hello, your amp comes with a 5-year transferable warranty. Good luck.

http://support.fender.com/warranty/FEND ... 9-2001.pdf


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Post subject: Re: Twin Reverb W/T blown fuse
Posted: Thu Oct 29, 2015 4:41 pm
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Thanks I'll let them fix it. 8)


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