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I agree with Mikirob that you can have a great time with swapping tubes in the FX10 and that it's possible to make an improvement in the sound of the stock tubes.
If you're not comfortable with navigating the world of NOS tubes by yourself there are some excellent dealers like Jim McShane and others who can give great advice and provide you with tubes that are tested and matched.
Another alternative is to go for some of the best new production tubes like the Gold Lion EL84s and 12ax7s. Buying them from a reputable dealer is recommended there, as well.
I agree with Mikirob that you can have a great time with swapping tubes in the FX10 and that it's possible to make an improvement in the sound of the stock tubes.
If you're not comfortable with navigating the world of NOS tubes by yourself there are some excellent dealers like Jim McShane and others who can give great advice and provide you with tubes that are tested and matched.
Another alternative is to go for some of the best new production tubes like the Gold Lion EL84s and 12ax7s. Buying them from a reputable dealer is recommended there, as well.