How Is A 6l6b Power Tube Different From A 6l6gc?

Discussion in 'Amps' started by CyFan4036, Apr 21, 2019.

  1. CyFan4036

    CyFan4036 Well-Known Member

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    Just picked up a new tube amp with a terminal case of tube rattle in the power tubes. They're 6L6b Groove Tubes and I can't find them for sale. I find a bunch of 6L6gc for sale however. I read that all modern 6L6s are gc's but mine clearly are modern and clearly display 6L6b. What am I missing? I LOVE the tone so I want to know so I can order new tubes without changing tone and headroom too much. Thanks guys!
     
  2. mozz

    mozz Well-Known Member Supporting Member

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    Google has some bad stuff to say about them. Lower powered 5881 russian tube. Don't know if you can still get them.
     
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  3. CyFan4036

    CyFan4036 Well-Known Member

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    I guess I'll go for some 6l6gc then! My Google skills must lack, I didn't find anything but gb suffix tubes. Thanks!
     

  4. eldos1

    eldos1 Well-Known Member

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  5. mozz

    mozz Well-Known Member Supporting Member

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    "Groove Tubes 6L6B Practically every time I get an email from someone complaining about how their amp crapped out on them (usually lost almost all its volume), they always mention that their amp worked fine before they installed the GT 6L6B. What makes this one especially scary is that putting in the old tubes did not fix the problem! Do not use this tube; after all the emails I've received I can only determine that this one is an amp killer. All I know about it is that the "typical power ranges from 20 to 25 watts," which couldn't be more ambiguous. So stay away! I can no longer find this tube on Groove Tubes' website, which means they either renamed it or scrapped it altogether?hopefully the latter. And to think that "the 6L6B is perhaps the most reliable of the currently made types of 6L6s." (Groove Tubes quote) Yikes!
    If you use any of these tubes, do not be surprised if the tubes go and the amp goes with them."


    https://el34world.com/Forum/index.php?topic=15294.0

    https://www.ultimate-guitar.com/forum/showthread.php?t=1233860

    I don't think you are going to be able to buy them anyway.
     
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  6. CyFan4036

    CyFan4036 Well-Known Member

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    I just stumbled into an answer to my own question so I'll post here for future generations. The GT 6l6B is now the GT 6l6R Gold Series. It even says on the tube "aka GT 6l6B."
     
  7. CyFan4036

    CyFan4036 Well-Known Member

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    Ummm...YIKES! I just ordered a quartet of GT 6l6r's on Reverb.(n)
     
  8. andrewsrea

    andrewsrea Well-Known Member

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    The original 6L6B's were a lower max plate wattage rating. I think up to the B they were 22 watts, the 25 watts at 'B' and 30 watts at 'G,' a.k.a. 'GC'.
     
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