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Thanks for the advice. I have no idea what chinese tubes to look for though! Have very little experience with changing out tubes. Any specific models?

Hi all...first post. I'm thinking about changing the tubes on my studio .22....my one and only amp! The tubes are at least a few years old. In the 1st position (closest to the input) is an electro harmonix12 ax7. The rest are Mesa 12ax7's. Do you think i'll hear a noticeable difference with...