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Old 09-29-2012, 06:01 PM   #1
bAngiel01
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Tube Issue - Help!

I was playing my Vypyr Tube 60 about twenty minutes ago when I heard a low hum, which got louder and louder until my amp shut off entirely.

I looked behind my amp (figuring it was a problem with the tubes), and there was a weird smell coming from the back. The tubes were super hot at this point (and I had only been playing for half an hour or so), so I took them out to let them cool.

Is this all pointing to a tube failure? I've had the amp for 8 months or so, but I bought it used, so I don't know how old they are or what shape they would be in by now or what.

Any help would be greatly appreciated.

If this is a tube failure, does anyone have any good tube suggestions for a Vypyr 60? I'm thinking I'll just go with JJs, but I'm open to suggestions.

Thanks.
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Old 09-29-2012, 06:06 PM   #2
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Hmm, tube bad you didn't see them before it turned off. Would you say the tubes were much hotter than they normally are after you've been playing?

As a guess I'd say one of the tubes redplated and that likely blew a fuse. Replace any fuses that blew and replace the output tubes and see if that doesn't sort you out.
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Old 09-29-2012, 06:17 PM   #3
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Quote:
Originally Posted by Kevin Saale
Hmm, tube bad you didn't see them before it turned off. Would you say the tubes were much hotter than they normally are after you've been playing?

As a guess I'd say one of the tubes redplated and that likely blew a fuse. Replace any fuses that blew and replace the output tubes and see if that doesn't sort you out.


I can't believe I forgot to check the fuse...

The fuse is blown. I guess the tubes did redplate. I'll buy the fuse first, and if that doesn't fix it, new tubes may be in my future.

Thanks!
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Old 09-29-2012, 06:28 PM   #4
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JJs

6L6

Matched

Get some contact cleaner too for the tube pins
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Old 10-03-2012, 11:24 PM   #5
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Okay, so I have the new tubes, and the fuses are on their way.

Right now, I don't have access to electronic contact cleaner. Is there anything that I can use as a substitute? Rubbing alcohol, perhaps?
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Old 10-03-2012, 11:37 PM   #6
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Rubbing alcohol is full of oils. You'd be better off using vodka. Don't use Vodka. It's best to get proper contact cleaner. It's pretty cheap, just jump on ebay. Otherwise you can just push them in and pull them out a few times. Have a look at the pins after doing it. If they are covered in filth, clean it off and do it again. It won't do as good a job as it will if you have contact cleaner on the pins but it will work to a degree.

Now this is important. We have had biasing problems on a Vyper Tube in here before. The smell you detected may have been the biasing resistor burning out - not good.
Once you put the tubes in the amp turn it on in a darkened room. Doesn't have to be pitch black but pull the curtains and turn off the light. Position yourself so you can see the tubes clearly and sit next to the power switch (mains switch will be fine). Now watch them carefully. If they go red turn off the power immediately. Orange is ok, yellow is ok, blue is ok, purple is ok, red is very very bad.
If they go red your amp will need repair, otherwise rock out and have fun.
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Old 10-04-2012, 11:48 AM   #7
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I'm glad I asked before I tried anything. My roommate said it should work and some hits on Google seemed to indicate the same thing. Thanks, Cath.

As I said, I'm still waiting for the fuses, but I'll make sure to keep a good eye on the tubes when everything is reinstalled and I turn the amp on.

If something goes wrong and the problem is the biasing resistor, I don't have a warranty. I bought the amp used, so I'm on my own here. Is this anything I could fix on my own?
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Old 10-04-2012, 11:56 AM   #8
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And to be more specific, the part you should be looking for to turn red is the plate. Heres a good example of what you don't want to see:



In that video it takes a little while for it them to redplate because he just cranked the bias on the amp. If your bias resistor is burnt out they should red plate almost immediately like cath said.

Just wanted to post that vid so you know exactly what you're looking for.

Cath can correct me if I'm wrong, but if you do end up red plating the tubes you should probably replace those tubes after having the amp repaired.
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Old 10-04-2012, 12:01 PM   #9
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Thanks. The video is really helpful. Now I know exactly what to look for.

I really hope that I don't have to buy new tubes. Should I be able to test the redplating issue with the old tubes before risking ruining the new ones?
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Old 10-04-2012, 12:04 PM   #10
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Quote:
Originally Posted by bAngiel01
Thanks. The video is really helpful. Now I know exactly what to look for.

I really hope that I don't have to buy new tubes. Should I be able to test the redplating issue with the old tubes before risking ruining the new ones?


I dunno. I've only ever had one set of tubes redplate and that was because they were old and dying, so I never used them again.
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Old 10-04-2012, 12:13 PM   #11
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Kevin - that was too subtle


this is more descriptive visually




But yeah, what Kevin is saying is correct.
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Old 10-04-2012, 12:14 PM   #12
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Damn, that dude nuked that tube.
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Old 10-04-2012, 12:16 PM   #13
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Quote:
Originally Posted by Kevin Saale
Damn, that dude nuked that tube.

No.

This guy nuked a tube

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Old 10-04-2012, 12:20 PM   #14
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Hmm, and TS, if your tubes look like that then that means you put them in the microwave.
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Old 10-04-2012, 12:32 PM   #15
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I don't have any lightbulbs in my house; just tubes in microwaves.
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Old 10-04-2012, 02:09 PM   #16
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Note to self: keep tubes out of the microwave.

So, if my tubes start to redplate, they should be thrown out? Even if they're brand new?
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Old 10-04-2012, 02:23 PM   #17
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I don't know what the gospel on that is.
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Old 10-09-2012, 12:28 PM   #18
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*Update*

I installed the new tubes and fuse. No redplating. The amps sound awesome--better than it did with the old tubes, for sure. Thanks, everyone!
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Old 10-09-2012, 12:58 PM   #19
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Btw, redplating means it is breaking, not that it is necessarily broken. You will often survive it fine if it doesn't go on for too long. If you see red hit the power switch as fast as you can. Your Vyper has no bias adjustment so it means either the tubes are rat shit or something else inside there is broken. Either way action needs to be taken.
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Old 10-09-2012, 01:06 PM   #20
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Quote:
Originally Posted by bAngiel01
*Update*

I installed the new tubes and fuse. No redplating. The amps sound awesome--better than it did with the old tubes, for sure. Thanks, everyone!




sweet deals
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