#1
I seem to remember a pretty big thread on this once, but I couldn't find it.

Alright. My Peavey has been running a set of JJs for the past year and a half, and I have played it pretty god damn hard in that time. It's been wonky lately, and I think it's the tubes. Time to change.

I've got a complete set of tung-sols on hand, but I know nothing about biasing. Do I need to? If so, what do I need in order to do so? Going from JJ EL84s and 12AX7s to Tung-Sols; would rather avoid being electrocuted. I would also REALLY like to do this myself, immeadiately.
#2
The power tubes are the ones that need biasing.
But if you got a "Matched Quad" set of power tubes, you don't need to.
Only complete tone freaks like Eric Johnson and EVH would consider doing it..

don't worry about being electicuted just by changing tubes...
Just don't reach inside the chassis where all the electronic stuff is..


You can change them yourself, just be careful and take your time.
The retainers on the C30 are a little tricky to get off and back on.
I actually broke the tip off a tube the first time I did it.

Just be carefull and don't be in a rush.

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2001 MIM Standard Strat
Peavey Classic 30 112 Combo.
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#3
Quote by jonmo1
The power tubes are the ones that need biasing.
But if you got a "Matched Quad" set of power tubes, you don't need to.
Only complete tone freaks like Eric Johnson and EVH would consider doing it..

don't worry about being electicuted just by changing tubes...
Just don't reach inside the chassis where all the electronic stuff is..


You can change them yourself, just be careful and take your time.
The retainers on the C30 are a little tricky to get off and back on.
I actually broke the tip off a tube the first time I did it.

Just be carefull and don't be in a rush.

I honestly do not know if they are matched. Any way to check?
#4
Where did you buy them?

To be honest, I don't think there's a way to tell by just looking at them.

But when you order them, it should be indicated at the time of purchase.

If you buy from http://dougstubes.com they are matched..

2001 Ernie Ball Music Man Axis Super Sport
2001 MIM Standard Strat
Peavey Classic 30 112 Combo.
My Gear
#5
Quote by jonmo1
The power tubes are the ones that need biasing.
But if you got a "Matched Quad" set of power tubes, you don't need to.
Only complete tone freaks like Eric Johnson and EVH would consider doing it..


Actually biasing is somethign YOU MUST do on a fixed biased amp. However the Classic 30 is cathode bias. All you have to do is to pop in those tubes. Don't even need to worry about them being matched.
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#6
I got them from the guy I bought the amp from - he included a set of tubes in the deal. I don't have a way to contact him to ask either.

No device I can measure them with or somesuch?
Quote by Gabel
Actually biasing is somethign YOU MUST do on a fixed biased amp. However the Classic 30 is cathode bias. All you have to do is to pop in those tubes. Don't even need to worry about them being matched.

Well, that's good to know. Thanks.
Last edited by Flying Couch at Sep 21, 2009,
#7
Quote by Flying Couch
I honestly do not know if they are matched. Any way to check?

Ya, but not without some pricey equipment that I'm guessing you don't have.
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#8
Biasing and having matched power tubes are not the same thing. Almost all amps need matched power tubes- that doesn't have anything to do with biasing them in this context.

In either case, you don't need to bias the C30.

If you've got four El84s of the same brand, they're probably matched.

Here's the tube thread, btw.
https://www.ultimate-guitar.com/forum/showthread.php?t=473149
#9
Quote by tubetime86
Ya, but not without some pricey equipment that I'm guessing you don't have.

Fortunately for me, my father is an engineer, so I have access to lots of pricey equipment. Doesn't seem I need it, though.
Quote by Roc8995

I remember that used to be stickied... oh well.

@everyone: So, a simple pull-n-replace job, then. Thanks guys.