I bought my Triple X Super 40 EFX Combo like in January and recently, it sounds like the distortion on it has lost it's gain. My gain used to be on 4 for metal but now I have to push it to 6 to have a decent gain.

My amp uses:
3 - 12ax7 pre amp tubes
2 - 6l6gv power amp tubes

Is this the time to change the tubes? Any suggestions for tubes?
Electroharmonix for the 12AX7s... Lot of the metal guys like JJs for 6L6s.
Hi, I'm Peter
First of all how often do you change your strings? those could be a factor rather than the tubes. Distortion(in this amp) mostly comes from the preamp, and 12ax7 last very long, so changing the tubes will help but is not practical.
Ibanez -> Peavey -> Eardrums

Apparently I'm on some list of people to listen to..?
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So I change them all?

Start with just the power tubes.
The prices I gave you were for a complete retube.