#1
Hello everybody. I have a problem, and really need expert advice.
I own a Kerry King Signature Marshall top, which is a couple of years old. While using it i noticed a kinda burned smell, looked behind it and saw one of my tubes was kinda blue'ish. That means the tube is done for it right? So my question(s)-
Where should I buy a fairly cheap tube, and do I have to replace all 4? Or can i only replace one of Them? And do i need to pay for a recalibration of the amplifier?

Thank you very much.
Joho90
#2
As far as I know I don't think tubes are supposed to make a burning smell. I'd have it checked by a tech to make sure nothing fried on you.

If it is just a tube issue you will need to replace the tube, yes. And chances are if it's a couple years old without a retube the others are right behind that one. Tubes are sold as matched pairs and quads so they bias evenly. You should definitely replace all 4 power tubes.

Tube depot, eurotubes and doug's tubes are all reputable dealers that will give you a fair price. Buy tubes from them and take the amp to a tech for biasing and a once-over. You could bias it yourself, but as I said before best to check nothing else is wrong.
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#3
The blue color is completely normal.

It could be dust burning off the tubes if you don't keep it covered.
Did you notice any drop in volume or a change in your tone?

If you buy a set of power-tubes, buy a matched set of 4 and get it re-biased for the best results. But I don't think you need to change tubes for what your describing
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#4
I sometimes forget to put the cover on, and it definately smelled like burnt dust.
But are you guys sure that blue'ish color is alright? I always Think its a little lower volume after I've been playing a while..
#5
The only bad tube color is red. Orange blue and purple are all good to go.
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#6
Quote by Joho90
I sometimes forget to put the cover on, and it definately smelled like burnt dust.
But are you guys sure that blue'ish color is alright? I always Think its a little lower volume after I've been playing a while..


Yes blue is 100% normal and is just impurities in the actual tube.

Now you did say the amp is a few years old and you can sometimes hear what seems like a volume drop. You may have a dying powertube or tubes if you are truly experiencing volume drops and a new set of tubes would not be bad to have on hand.
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate
#7
Quote by Offworld92
The only bad tube color is red. Orange blue and purple are all good to go.

when a tube blows white it is also bad.

i actually just had a tube go white on me a little while ago, i had never seen it before. it must have been pretty messed up.
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