Most RELIABLE power tubes?? (6550s)

Discussion in 'Amps [BG]' started by oboylebass, Feb 23, 2014.


  1. oboylebass

    oboylebass

    Joined:
    Oct 31, 2006
    Location:
    AMERICA
    Hey Guys, just wondering if someone can comment on the reliability of the various brands of power tubes. Specifically, 6550s as found in the Ampeg SVT 2-PRO. I've used several brands (EHX, Sovtek, Tung-Sol) and have had mixed results. The problem is usually bad tubes, or tubes seemingly going bad after a short period, which usually results in the amp shutting down on a gig. Thanks.
  2. beans-on-toast

    beans-on-toast

    Joined:
    Aug 7, 2008
    My favorite 6550 is the NOS GE6550A. Well, you asked. Expensive but they offer a long service life.

    No matter what brand of tubes you buy, what helps when buying tubes is to deal with a reseller who burns in the tubes, puts them through a rigorous testing procedure, and offers a warranty. It costs a little more but worth it. This is a good place to deal with.
  3. Mr. Foxen

    Mr. Foxen

    Joined:
    Jul 24, 2009
    Location:
    Bristol, UK
    Disclosures:
    Amp tinkerer at Ampstack
    Ones installed in a well maintained amp that is looked after, has its bias checked often and isn't moved about whilst still hot.

    Tubesync helps the bias thing: http://www.tubesync.co.uk/

    There is the Bugera copy of that too, Infinium.

    That stuff makes much more difference that the writing on the glass.
  4. oboylebass

    oboylebass

    Joined:
    Oct 31, 2006
    Location:
    AMERICA
    Good info thus far. Any other thoughts out there from players??
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  6. jmpiwonka

    jmpiwonka Supporting Member

    Joined:
    Jun 11, 2002
    got some tung sol reissue tubes from tctubes, the place beans on toast linked...power tubes are still fine after 2.5 yrs.

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