mysterious "dips" in volume

Discussion in 'Amps and Cabs [BG]' started by Gabu, Mar 14, 2002.

  1. Gabu


    Jan 2, 2001
    Lake Elsinore, CA
    In a solid state Ampeg SVT 400T I was looking at the volume "dips" after playing steady notes for a minute or so.

    What does this indicate? If I bought this at a discount, would the repair likely be expensive?

    Thanks in advance!!