#1
I just retubed my Peavey Triple XXX head because the old power tubes would glow the usual orange as all tubes do with the STANDBY switch on, then when I switched the STANDBY to off and the casing of all the power tubes would also glow blue except for the far left one.

Is this even a problem?

I ask because even though I've retubed the head, the same thing still occurs.

help? =[
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#2
Apparantly valves glowing blue isn't always a problem? Does it sound okay? If so, I reckon you're ok.
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#4
Well I currently have to run it through a small combo since I don't currently have a cab and I'm still unaware of how this thing sounds when it's cranked, plus I still need to bias the tubes as well....
Guitar:
Schecter Tempest Custom
Amp:
-currently looking
Pedalboard:
KORG pitchblack
BOSS SD-2
iSP Decimator
Ibanez DE7
#5
Quote by kurtlives91
Tubes glowing blue is fine, its quite normal.

But what if all but 1 of them do....
Guitar:
Schecter Tempest Custom
Amp:
-currently looking
Pedalboard:
KORG pitchblack
BOSS SD-2
iSP Decimator
Ibanez DE7
#6
bump
Guitar:
Schecter Tempest Custom
Amp:
-currently looking
Pedalboard:
KORG pitchblack
BOSS SD-2
iSP Decimator
Ibanez DE7
#7
It shouldnt matter if the tubes glow or not. Maybe the tube is of a different manufacturer or a different batch.
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Peavey Rage 158
#8
Quote by JO-E-E
But what if all but 1 of them do....

It's fine, they don't have to glow blue or anything.
#9
As long as they don't look damaged or broken they're fine.
Keeping it real since '92
#10
I have never had my tubes glow blue..I kinda want to see that.
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#11
a blue glow is usually an indication of an air leak. Certain types of tubes have inert gas that glows purplish when the tubes are hot, but the XXX doesn't use those.
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#12
Quote by Kid_Thorazine
a blue glow is usually an indication of an air leak. Certain types of tubes have inert gas that glows purplish when the tubes are hot, but the XXX doesn't use those.
I've never heard that for blue glow. I've always been told it was fluorescence from collisions of free electrons with impurities in the vacuum that release photons upon excitation.
Last edited by al112987 at Feb 22, 2009,
#13
Quote by al112987
I've never heard that for blue glow. I've always been told it was fluorescence from collisions of free electrons with impurities in the vacuum that release photons upon excitation.


bingo, that's why it usually means air leak, or poor quality tubes.
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#14
it's normal...yes, it indicates gas in the tube, but you'll never have a tube that is completely gas free, it's impossible. So, you'll have a bue glow. If you watch closely when you play, the blue usually moves around a bit, neat little visual show.

If the plates (the bug grey metal structures) start glowing red or orange on the other hand...you have two options:

1) turn down the bias current and save your amp
2) grab some popcorn and a video camera, cause the tubes are about to melt down (probably taking the OT with them).

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#15
I guess it should be noted that it depends on how much of a blue glow there is, if theres a faint blue halo around the filament then that's normal, if the entire tube is glowing blue then you have a problem (usually).

I've been playing tube amps for years and have never had tubes that visibly glowed blue under normal operating conditions.
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#16
Quote by Kid_Thorazine

I've been playing tube amps for years and have never had tubes that visibly glowed blue under normal operating conditions.


Every amp I've worked on, built, or played in the last 5 years has had a blue glow (the ones I've looked at at least). EL34s are good at this, as their vacuum isn't as hard as others.

I've had an amp running a pair of JJ 6V6s biased at 95% max dissipation at 10-30 volts over their rated max that have a crapton of blue light coming out. It's run like that for a year...getting close to thinking about replacing the tubes. Still running great.

EDIT: though, that prolly says something about JJ tubes than anything else...
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