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Ampeg SVT-4 Pro Preamp Question

Discussion in 'Amps and Cabs [BG]' started by mstone564, Apr 14, 2014.

  1. mstone564


    Dec 14, 2009
    Sup guys!

    Recently I feel like I've been having to crank the gain on my amp a lot more than normal to get it "peaking" where it normally does.

    I'm thinking it's a preamp tube(s) issue, so what would be the best way to check for a bad tube?

    Also, if it is a tube, what would you all recommend as a replacement? I like my 4 Pro to be as clean as possible because I just use distortion pedals for my sound.