6l6gc vs 6l6gc-str

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by cygnusx1, Mar 7, 2015.

  1. cygnusx1

    cygnusx1 Member

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    Ok guys, this is probably a stupid question, but here goes. I have a Clark piedmont that uses 6l6gc tubes. It is a 59 bassman clone. Good sound but as with anything I own, I must experiment. Is there any difference in the tubes I listed? Obviously they are the same style but what is the str designation? Also would the bias need to be different? Thanks.
     
  2. wyatt

    wyatt Member

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    Ultimately, they are just different model names. Bias the same.

    In ye olden days, a company make a big tube purchase from RCA, GE, etc., sometimes there would be specific criteria, orher times it was simply a OEM fulfillment. These would be deemed (S)pecial (T)ube (R)equest.

    These days modern companies just throw on suffixes like that as 1) marketing and/or 2) to guve a differentiating model name.
     
  3. Blue Strat

    Blue Strat Member

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    What Wyatt said. Anything with a 6L6 number that's glass (not metal, like some 1940's tubes) will work fine in a '59 Bassman style amp. Rebiasing will be required no matter which one you choose.

    The TAD 6L6WGCs are good, economy minded, tubes.
     
  4. DaveKS

    DaveKS Member

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    As pointed out above if your talking modern tubes it really is nothing but labeling.

    Now if your talking early Sylvania tubes, there was a difference in tone, at least to me ears of the early short bottle pre-STR 6l6gc tubes.
    All STR ones seem to be after they went to tall bottle design shown on right 2 tubes here.
    [​IMG]

    The short bottle on left is what is referred to as a pre-STR Sylvania, it has a narrower, more pronounced mids tone than later Sylvania, I actually usually prefer these in bassman and twin amps because of their more mids focused sound. It to my ears is one of the tubes that had a little bit more of a distinctive sound compared to later STR, GE ones.
     

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