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Post subject: Fender Deluxe Reverb Reissue keeps blowing fuses
Posted: Wed May 13, 2009 5:05 pm
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Help me guys. My DRRI keeps blowing fuses. What's the first thing you guys would look at (Power tubes/Preamp tubes/etc)?


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Posted: Wed May 13, 2009 5:26 pm
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It's usually the Power Tubes.


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Posted: Wed May 13, 2009 5:28 pm
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63supro wrote:
It's usually the Power Tubes.


I keep hearing that.


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Posted: Wed May 13, 2009 8:18 pm
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Actually, I would check the rectifier tube as well...I see as many of those that cause blown fuses as power tubes...


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Posted: Wed May 13, 2009 9:05 pm
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Rectifier is the most common problem for blowing fuses like that.

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Posted: Wed May 13, 2009 10:08 pm
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Dosn't that have a 5AR4 rectifier tube in it? I would look at that, you could pull it and put in a new fuse then replace the tube. If you want you can check the filter caps before you put the tube back in. But warning if you do not no what you are doing beware :shock:

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Posted: Thu May 14, 2009 4:49 am
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yes, it has a 5AR4/GZ34 in there.


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Posted: Thu May 14, 2009 5:41 am
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dedmouse wrote:
Actually, I would check the rectifier tube as well...I see as many of those that cause blown fuses as power tubes...


Agreed. Most of the time a bad power tube will cause a fuse to go but with the new production 5ar4/gz34 in your amp I would suspect that it is the rectifier tube.


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Posted: Thu May 14, 2009 11:36 am
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I forgot that amp had a rectifier tube. Seriously, check that first. Sorry about that. Like another poster said, pull it, fire it up, and see if it still blows. If it does, check the power tubes.


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Posted: Thu May 14, 2009 5:43 pm
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Actually, no. If you pull the rectifier first then there is no high voltage when you flip the standby switch to off** therefore there is no high voltage to blow the fuse.

Pull the power tubes first leaving the rectifier tube plugged in. If it still blows the fuse then it's possible that the rectifier is shorted.

If it doesn't blow the fuse, plug the power tubes in. If you blow the fuse again, then you can probably guess that one of the tubes is shorted.

Best to replace both tubes if you find that the power tubes are the culprit because if they are older tubes, if one shorted, the other one probably isn't far behind it.


Now, if you're blowing a fuse as soon as you flip the power switch on (with the standby on) then you have different issues like a bad power transformer or shorted surge protector, etc.

**to clarify the standby switch positions, "on" means amp is ON standby, OFF means high voltage is now applied to power tubes.


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