Germino Club 40 with KT66s ?

Discussion in 'Amps and Cabs' started by Kenny Blue, Apr 19, 2015.

  1. Kenny Blue

    Kenny Blue Supporting Member

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    Has anyone run KT66 tubes in their Germino Club 40 ?

    I have read that it is possible to do but have not read (or heard any demos) any comments about anyone doing it and how it sounded.

    Does anyone know if this can really be done safely ?

    I imagine the amp needs then to be re-biased.

    Wondering how the tone, response of the Club 40 is with KT66 compared with a JTM45 .
     
  2. Blue Strat

    Blue Strat Member

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    Any power tube change will require a rebias even if it's to the exact same type that are in there now.

    What are the stock tubes?
     
  3. louis

    louis Supporting Member

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  4. Kenny Blue

    Kenny Blue Supporting Member

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    Stock tubes in a Germino Club 40 are 2 EL34s. It's modeled after a JTM50/JMP50. Has tube and SS rectifiers.
     
  5. Kenny Blue

    Kenny Blue Supporting Member

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    I am interested in any experience anyone has with KT66s in their Club 40 and any comparisons of the tone and response between that and a JTM45 type amp.
     
  6. Holliman

    Holliman Triad Abuser

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    The Club 40 is not a JTM45. Germino makes a Classic 45. Quite a bit different.
     
  7. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    It will be a fairly subtle difference IMO.
    just the powertubes alone won't make it sound the same as q jtm45
    The mix resistors, voltages and output watts on the OT are all different.

    They're still bass spec Marshall in sound, but the club 40 is louder and tighter even with kt66.

    (FYI my experience is with similar amp not specifically germino but same basic spec)
     
  8. Kenny Blue

    Kenny Blue Supporting Member

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    Thanks... Yes I do realize that they are different circuits... that's why I am asking.
     
  9. Kenny Blue

    Kenny Blue Supporting Member

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    The reason I am asking it this....

    I recently bought a MetroAmp JTM45. I like the amp... and I prefer the tone and response of the KT66s to EL34s.

    But I find, after days of playing around with this amp, that I am wishing it was less bassy/wooly and had more articulate / well defined notes while keeping the KT66 characteristic tone. I am running the amp through a Scumback H75, 100 watt speaker so the speaker is fairly clean and efficient.

    I do not have the understanding/knowledge at this point to know what values to change within the circuit to change tonal quality and judge what choices there are for doing that.

    So I am wondering if it is possible to "clean up" the sound with some changes in the JTM45 circuit so that I have that basic KT66 platform or consider trading the amp for a Germino Club 40 and putting KT66s in it.

    It is my understanding that the Club 40 is based on the JTM50 and JMP50 Marshalls which did make the tone/notes more well defined and less "wooly". (And yes please do correct me if my understanding is incorrect).
     
  10. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Have a tech change your mix resistors to 470k, put a solid state recto plug in, and mane increase the preamp filtering.

    50 bux in parts and 2 hours labor tops.
    It'll do what you wanwithou having to get a new amp.
     
  11. lgehrig4

    lgehrig4 Silver Supporting Member

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    In my JTM45 I prefer KT66s over 6L6, 5881 and EL34. I also have a Cornell Plexi 45/50 that came with EL34s and I tried KT66s. They sounded good but not as good as the EL34s.

    What you're hoping to achieve with the KT66s I experienced in reverse with the Cornell. Definitely less articulate and flubbier. It works with the JTM45 though.

    What brand tubes do you have in the Club 40 now? Believe it or not, my current favorite for non master Marshall types is Electro Harmonix. Does something real nice in the mids and tightens up the low end. I think it's a reduced low end. Pretty cheap. Give them a try.

    And yes I tried these in a Club 40 too. They beat out JJs, Winged Cs and Siemens. That last one surprised me.
     
  12. Kenny Blue

    Kenny Blue Supporting Member

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    Thanks Mike ! That's just what I was wondering. I have already found a good tech in this area and contacted him about possibly doing a PPIMV so I could have him do this additional work along with the MV.

    I have a Weber Copper Cap Rectifier that I could use unless you would recommend something different.
     
  13. Kenny Blue

    Kenny Blue Supporting Member

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    There are JJ 12ax7s and Gold Lion KT66s ... And a Chinese Rect tube.
     
  14. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Copper cap is still supposed to sag.
    Is get a regular solid state plug in.

    The mix resistors will likely do the trick though.
     
  15. How

    How Supporting Member

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    I've been thru the try to make an amp into something it's not more than once. Never seems to work out. Sell the JTM45 and get the Club 40. Don't get hung up on the KT66 tubes.
     
  16. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Those circuits are so close it's pretty easy to accomplish what he wants with the tubes he wants cheaply.
     
  17. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    But yes given the choice I'd much rather have a c40
     
  18. lp144

    lp144 Supporting Member

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    Metro 45 user here with 5881s. I like the one finger tone setting...run one finger under all the tone controls until they hit 10. I tightens up the bass, lets the amp sing.
     
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  19. lgehrig4

    lgehrig4 Silver Supporting Member

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    Ok, in misunderstood. From your original post I thought you had a Club 40 and wanted to try KT66s.
     
  20. gillman royce

    gillman royce Member

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    great advice
     

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