Do I need new tubes?

Discussion in 'Amps and Cabs [BG]' started by Funkateer, Nov 1, 2003.

  1. Funkateer


    Jul 5, 2002
    Los Gatos, CA
    I acquired a used DB 359 and have been enjoying it for the last half a year or so. Recently, after it is thoroughly warmed up (2+ hours or so), I sometimes get a soft pop followed by a hiss that goes away after 10 seconds or so. This is an intermittent problem. Sunspots? Tubes that need replacement?

    To generalize the question: How do you know when you need to replace tubes? Only after they fail? Or are there 'soft' failure modes where they still function, but not properly?
  2. You have capacitor or connection (probably connection) problems, not tube problems. Aggie's warranty ought to cover it. Tube life for preamp tubes is life of the amp, power tubes every 10-30+ years, depending on the make and amount of use.
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