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Old 09-02-2012, 02:52 PM   #1
DeathMetalJesus
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no output from lead or crunch channel

Ok guys get the jokes and flames out of the way im ready for them.

I have a Bugera 333xl infinium head paired with a bugera 4x12 cab.

I was playing on the lead channel today when all of a sudden the volume sputtered and died. I tried switching to crunch and no output. The only channel that is acting normal is the clean channel.

If i crank up the master and channel volumes i can hear a faint sound from the lead channel. but just a whisper quiet echoey fizz.

I bought the amp new about 9 months ago so its still under warranty but if its an easy fix id rather do it myself.

My first thought was one of the pre amp tubes but I have no knowledge or experience in amp repair / troubleshooting.


Again im expecting all the fire extinguisher jokes / thats what you get for buying shit / should have got a real amp comments so get them out of the way right off the bat :/
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Old 09-02-2012, 03:03 PM   #2
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Quote:
Originally Posted by DeathMetalJesus
Again im expecting all the fire extinguisher jokes / thats what you get for buying shit / should have got a real amp comments so get them out of the way right off the bat :/


The thing is that they are not jokes. Bugeras do tend to light up more than other amps. And if it's in the warranty just send it there, much easier and you can't screw up anything. And I think that the warranty becomes void if you go fiddling with it yourself, so take good advantage of it while you can.
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Old 09-02-2012, 03:09 PM   #3
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I really thought I had a good one. I played it about 3 times a week for several hours in a band setting for the better part of a year now with no issues whatsoever and just sitting practicing at home it died. I've been kicking myself all afternoon.
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Old 09-02-2012, 03:09 PM   #4
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Try replacing the preamp tubes, seems the most likely culprit in this case.
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Old 09-02-2012, 03:12 PM   #5
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how long do preamp tubes usually last before replacement is needed?
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Old 09-02-2012, 03:14 PM   #6
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Quote:
Originally Posted by DeathMetalJesus
how long do preamp tubes usually last before replacement is needed?

Depends. I had tube go bad on my 6505 within a few months.
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Old 09-02-2012, 03:16 PM   #7
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Tubes from the 50s and 60s have been known to go 10 or 20 years. Quality tubes made in the past 10 or so years, probably about 5 years, although it obviously all depends on use. Cheap tubes like whats in bugeras, who knows. 1 year with the frequency you use the amp isn't bad. It should be noted though, that a tube can die at any time for any reason, its one of the downsides to the technology. Thats why one should always have spares.
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Old 09-02-2012, 03:19 PM   #8
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This is my first tube amp and I've never had to change a tube so I really dont know the first thing about the difference in brands ect. Could I just get an 11 dollar JJ 12ax7 and swap it untill i find the bad tube or should i do a full preamp section retube?
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Old 09-02-2012, 03:21 PM   #9
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If you have the money I'd swap all the tubes out for JJs. If not, you could buy just a couple JJ 12ax7s and figure out which has gone bad in your amp. Its really up to you.
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Old 09-02-2012, 03:29 PM   #10
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right now i only have the money to buy a few tubes otherwise id do a complete retube

edit: could this be something other than the pre amp tubes?

Last edited by DeathMetalJesus : 09-02-2012 at 03:49 PM.
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Old 09-02-2012, 04:00 PM   #11
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It could be, but given the symptoms, I'd say its unlikely. Either way, preamp tubes are the simplest to swap, so thats where you want to start. Even if it doesn't solve it, you have some spare tubes and thats always a good thing.
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Old 09-02-2012, 05:02 PM   #12
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If you can't afford new tubes, go in for the warranty. If that's the issue, they might replace them for you. That might not even be the issue, and they can diagnose it and probably fix it for free.
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Old 09-03-2012, 10:47 AM   #13
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im buying a few tubes today to see how it goes... How are groove tubes because i think thats all i can get around here from a physical store.
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Old 09-03-2012, 10:57 AM   #14
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Quote:
Originally Posted by DeathMetalJesus
im buying a few tubes today to see how it goes... How are groove tubes because i think thats all i can get around here from a physical store.


they are rebranded chinese tubes. but they work.
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Old 09-03-2012, 03:57 PM   #15
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Order JJs online. Grooves probably won't be much better than what you have in there right now, if at all better.
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Old 09-04-2012, 05:26 PM   #16
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I was at guitar center about to buy a 22 dollar groovetube 12ax7 when i saw this post and then thought better of it. If JJs really are that much better then I might as well wait. Plus theyre about half the price of the GC groovetubes.
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Old 09-04-2012, 05:41 PM   #17
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$22 for 12AX7s? That's ****in' ridiculous, especially because they're Groove crap. You should only be spending about $10 per preamp tube.
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