#1
I bought a used JCM 800 two years ago exactly. It has a pair of Groove Tube EL34s which the guy said he had recently put in when I bought it. I'm wondering:

1) Is it time to replace the tubes?

and

2) Will I get more gain from new tubes and/or DIFFERENT tubes?

I have played it only when jamming and practicing. Which has totaled maybe 30 hours of playing on it.
I woke up this morning and I got myself a beer. The future's uncertain and the end is always near.

Quote by BlackIce87
I'm not gonna lie, goin' mobile looks like Sebastian Bach in the eighties.
#2
damn thats pretty low hours on the tubes you should be good. i put in 30 hours on my amp in 2 or 3 weeks and after having my splawn 9 or 10 months its finally time for oa tube change

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Yeh the SICK! bit sounds a bit stupid.

#3
30 hrs??? They'd be lucky if they're worn in yet.
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#4
30 hours of playing isnt much at all. They shouldnt need to be changed, and changing power tubes wont give you any more gain, or it will barely be noticeable.
#5
1) No

2) You won't necessarily get more gain but you can change the voicing of the amp slightly by changing tube types. Putting 6L6 tubes in it won't make it a Fender, though, since the circuit has more to do with voicing than the tube choice.
Everyone is entitled to an opinion.

Feel free to express yours so I can make an informed judgement about how stupid you are.
#6
I know, 30 hours is low for tubes. I play usually around 7-10 though to get the most gain. Since the guy said he had "recently" put them in I was speculating as to how many hours he had played them, since he was in a touring band.

My main thought was just if changing to different tubes would give me more gain.
I woke up this morning and I got myself a beer. The future's uncertain and the end is always near.

Quote by BlackIce87
I'm not gonna lie, goin' mobile looks like Sebastian Bach in the eighties.
#7
Any way of contacting him to find out? If not maybe play it safe and buy a spare set of valves and keep them for when your current set fail.
#8
Don't you have to get the amp biased in order to change tubes?
I woke up this morning and I got myself a beer. The future's uncertain and the end is always near.

Quote by BlackIce87
I'm not gonna lie, goin' mobile looks like Sebastian Bach in the eighties.
#9
Quote by Goin' Mobile
Don't you have to get the amp biased in order to change tubes?


Ideally, you should re-bias after you've installed your new power tubes, but you don't have to.
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