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ed k
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Joined: 05 Aug 2008
Posts: 23
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 Posted: Thu Oct 29, 2009 6:26 pm Post subject: Blowin fuses |
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I've got a 4 yr old deluxe reverb that has started to blow fuses a lot. Tonight I turned on the amp (with it on standby) and within 5 seconds the fuse blew. I tried replacing the fuse, but every time it blew. Any suggestions for what I should look at first?
Ed |
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vjcor
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Joined: 09 Aug 2007
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| Posted: Thu Oct 29, 2009 7:49 pm Post subject: |
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Sounds like a power tube to me, but thats only because the same thing happened to me and that was the problem...
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peterp
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Joined: 16 Sep 2007
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Location: Ontario, Canada
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| Posted: Thu Oct 29, 2009 8:37 pm Post subject: |
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Agree power tubes would be the first place I'd be looking.
Possible could be something else, but failed tubes is a likely cause.
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CAFeathers
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aclempoppi
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Joined: 26 Jun 2009
Posts: 243
Location: Harvard IL
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| Posted: Thu Oct 29, 2009 9:22 pm Post subject: |
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Hi Ed, the prime suspects would certainly be the power tubes. You might want to remove the two 6V6's, turn the amp on and take it off standby. If it stays on you'll need new power tubes. If it still blows the fuse, the rest of the tubes should be removed, leaving only the rectifier tube in the amp. Switch it on and take it off standby. If it still blows the fuse, it is the rectifier tube, filter caps, or a short circuit. Given the age of the amp I'd suspect the tube. Hope you don't have go this far to isolate the problem. ART
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63supro
Professional Musician
Joined: 07 Aug 2007
Posts: 2347
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| Posted: Fri Oct 30, 2009 5:25 am Post subject: |
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| CAFeathers wrote: | | Rectifier is a common source for blown fuses too. |
Yep, without a doubt. |
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peterp
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Joined: 16 Sep 2007
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Location: Ontario, Canada
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| Posted: Fri Oct 30, 2009 8:09 am Post subject: |
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Oh that is good to know, I've never had fuse troubles from the rectifier tube when I had a good amp.
Of course my newer junkey amps have SS rectifiers.
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63supro
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| Posted: Fri Oct 30, 2009 8:50 am Post subject: |
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From what I remember, the Deluxe Reverb has a 5AR4 rectifier tube.
Nothing wrong with SS rectifiers. They sound a bit tighter and don't sag when you push them, not that sag is a bed thing either. Plus having $@! rectifier is a bit more reliable than a tube rectifier. A buddy of mine actually had his Deluxe Reverb (not the reissue) modded so he can switch back and forth depending on his mood and the tone he wants. |
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ed k
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Joined: 05 Aug 2008
Posts: 23
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| Posted: Fri Oct 30, 2009 12:11 pm Post subject: |
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Thank you all for the info. The power tubes are listed as 6v6GT's. Is there a preferred brand for replacements?
Ed |
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63supro
Professional Musician
Joined: 07 Aug 2007
Posts: 2347
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| Posted: Fri Oct 30, 2009 12:31 pm Post subject: |
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| If you like the way it sounds, just replace them with what ever is in it. I like JJ's, JAN Phillips and Tung Sol. It's all up to you and your style of playing and what guitar's you plug into the amp. |
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ed k
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Joined: 05 Aug 2008
Posts: 23
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| Posted: Wed Nov 04, 2009 7:47 pm Post subject: |
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So, I replaced the rectifier tube, and sure enough it stopped blowing fuses. However, I suddenly had a nasty case of tube rattle and the sound seemed compressed to me. So, I got a different rec tube and it sounds much better. I'm still not sure if the amp sounds as "open" as it did before I replaced the tube. Do you have to rebias when replacing the rec tube? Or, is it my imagination that the sound is different--subtly, but different.
Ed |
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aclempoppi
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Joined: 26 Jun 2009
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Location: Harvard IL
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| Posted: Wed Nov 04, 2009 9:22 pm Post subject: |
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Hi Ed, glad you rectified the problem!!
Yeah you should check the bias, because the plate voltage is probably higher now. This may have induced the tube ratlle because of the increase on the B+ power supply. If the power tubes aren't reasonably fresh, you might consider replacements. Of course, you should find the offending tube first. Never seen a failed rectifier take out any other components, so you should be in good shape. ART
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