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Do I need to retube?

Discussion in 'Amps and Cabs [BG]' started by reel big bassist, Aug 16, 2000.

  1. reel big bassist

    reel big bassist

    Mar 27, 2000
    I have recently purchased a used Ampeg
    SVT-300 that was made in 1991. It is a tube
    power amp, bassicly the power section of an
    SVT. The amp sounds great and has lots of power,
    but I'm curious if I need to retube it.

    When I bought the amp the salesperson told me
    that they had replaced some tubes. He said they
    did this because the previous
    owner had put some "weird" tubes in it. So when I turn
    the amp on and look in the back, 2 tubes are brigher
    than the rest. So they must of replaced 2 tubes.
    Do I need to retube?
    The amp sounds fine to me.
    However, this is my first purchase of a
    tube amp so I don't know what things I should listen for?
    If some tubes where newer than others, wouldn't the
    power be uneven? I know this last question sounds confusing.
    What I mean is wouldn't the power go up and down a lot.

    Gregory P

  2. First of all, It's a good idea to have a qualified tech look over the entire amp. With a little attention these amps will just about last for ever. (IMO)
    I recently purchased two tube amps. An Ampeg SVT and a V4b. The SVT had just been retubed and checked out fine. The V4b had not been looked at in years. It turned out all the tubes were O.K., it just needed to be re-biased. A nominal charge of $60.00.
    I now have peace of mind and am not afraid to gig with it and have something unexpected happen when I'm counting on it the most.
    Hope this helps
    Bass players....What a crazy bunch!
  3. reel big bassist

    reel big bassist

    Mar 27, 2000
    Today I went to bills music, and had
    the tech guys look over it.
    That took a load of my back.

    They'll tell me if anythings wrong with it.
    I personally don't think anything is,
    except since some tubes are running hot
    the amp might need to be rebiased.
    Better safe than sorry though.

    Thanks for the advice tom.
    Gregory P

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