TAD 6L6GC Vacuum Tube Review

Review – TAD 6L6GC-STR Tube

4:41 pm

Very close tonally to the JJ 6L6GC tube with a bit more going on and easily justifying the extra cost. These are labeled as an STR tube. STR standing for Special Tube Request. When a buyer goes to the tube maker and delivers a specific set of specifications the tube goes into production as a S.T.R. One of the best know is the old Sylvania 6L6 tall bottles with the designation STR387. The TAD 6L6GC-STR is matched for plate current and transconductance and has the look of an old Sylvania. Using the old school U.S. style 6L6 plate design and a shiny black plate material they look like American manufactured stock. The sound is all there. The TAD is very percussive or punchy if you prefer. This makes them great for palm muting or “chunky” down-stroke rhythm playing. They break up a bit earlier than a JJ or Svetlana so you can get a bit nasty by digging in with your pick or clean things up by rolling back your volume control. They had the best tone biased at about 70% of rated plate dissipation. That’s about 21 watts at idle for a tube with a design max output of 30 watts. Both this tube and the TAD 6L6WGC-STR had some initial drift in plate current and required about 20 minutes to settle. I would recommend installing the tubes with an initial bias setting close to your target and check them again after ten minutes in play mode with a final check and adjustment after twenty minutes.

4 Responses

  1. Miloslav Froněk
    Miloslav Froněk at |

    i want tu buy tad 6l6 wgc-str tubes for my music man 112rd-fifty,what do you say to that?
    it,s posiible?
    yours sincerely mila

    1. Sandra @ thetubestore
      Sandra @ thetubestore at |

      Yes it is a perfectly good choice. You may want to also check out the Preferred Series 6L6GC https://www.thetubestore.com/preferred-series-6l6gc

  2. Vincent Craig
    Vincent Craig at |

    How doe these 6L6 tubes compare the the Mesa Boogie branded 441 6L6 tube? Would I need to have the fixed bias adjusted in my Lonestar Classix 2×12?

    1. Jon @ thetubestore
      Jon @ thetubestore at |

      They are the same tube. Mesa just relabels with their own part number and brand. If you tell us when you order which amp you have, we will select a set that will bias appropriately without any need for you to modify. Just plug and play.


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