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  1. 12ax7 tubes labelled Marshall in red

    Amps and Cabs
    Hi everyone! I just picked up a 1971 Marshall Artiste 2040 combo. I'm trying to figure out if the four 12ax7 tubes that are in it are original to the amp. They are all labelled (horizontally) ECC83/C with Marshall written below that in red and only one of them still has a very small hint of a...