EL34, EHX6ca7, KT77,...Which for What

Discussion in 'Marshall Amps' started by scozz, Jan 28, 2020.

  1. scozz

    scozz Well-Known Member

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    So I know practically nothing about vacuum tubes. I see some of you guys replacing the EL34 power tubes in your Marshalls for some of these power tubes,...6ca7EH and KT77. I'm wondering what these tubes will do, for the amps your putting them in, that EL34s do not?

    Maybe that's not the best way to put it. What kind of tones do these tubes create in your Marshalls that make these tubes desirable?

    I have a SC20 that I've replaced the stock EL34s with a matched set of Mullard New Production EL34s and to me, my amps sounds a bit more dynamic,...for lack of a better word. So what would these other power tubes do for my SC20?

    Thanks!
     
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  2. Nik Henville

    Nik Henville Well-Known Member

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    My Marshall Club & Country has had both Genelex KT77's and Mullard EL34

    In my 'umble opinion the KT77's are cleaner and more "hi-fi" sounding than the EL34's

    But what do I know - I leave the EL34's in there because the Genelex's are like hen's teeth...

    :hippie::pirate::uk:
     
  3. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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  4. Filipe Soares

    Filipe Soares Well-Known Member

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    the only experience I have is changing the JJ EL34 in my Savage 60 to JJ KT77 and the change was very subtle. the amp is a little bit more "round" with the KT77.
     
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  5. South Park

    South Park Well-Known Member

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    The first thing you learn about tubes is the power curves are not all the same . The break up and how it breaks are not the the same
     
  6. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    It's really just a matter of personal taste, you try them and see which one you like better.
    They all work the same, but different bias levels.
    When you push the output into distortion/ overdrive, they break up differently and have their own particular voice.

    Descriptions / reviews don't mean much it's opinion which is subjective to the individual.

    Like for example: I build amps with JJ tubes and find them pretty good to my ears.
    Marshall Dog hates JJ tubes.
    So it's all an individual choice....I don't think that any is better or worse really. I like tomato, Marshall Dog likes tomattos.
     
  7. scozz

    scozz Well-Known Member

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    That's kind of what I thought @ampmadscientist, thanks. I think what I'm looking for is some adjectives from different folks on how these different choices sound and compare to each other.
     
  8. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    It's sales people who create the adjectives to lure you into buying more tubes.
     
  9. pedecamp

    pedecamp Well-Known Member

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    Read the tube descriptions online, they will describe what each tube type offer. Its not a big investment to buy tubes to try, only your ear can determine what you like, I suggest buy a pair of each to try. :yesway:
     
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  10. BanditPanda

    BanditPanda Well-Known Member

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  11. ken361

    ken361 Well-Known Member

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    Tungsol or EH, Rubys
     
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  12. scozz

    scozz Well-Known Member

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  13. ken361

    ken361 Well-Known Member

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    Depot has good for me.
     
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  14. Matt_Krush

    Matt_Krush Well-Known Member

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    Don't waste your money on the EH6CA7s.
    Have a set, tried them. Hate them.

    Great luck and tone from JJKt77s (dont care for their EL34s)
    And Great tone form Tung Sole EL34Bs.
    Right now...these are all I run.

    Get them matched...get them from Tubedepot (or wherever you like)
     
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  15. matttornado

    matttornado Well-Known Member

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    from my experience, the differences are so subtle , no "holy crap! that sounds so much different" kind of thing.
     
  16. junk notes

    junk notes Active Member

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    I have no reference to these great little small amps, as I come from the big boy neighborhood of power tube rolling.
    I honestly do not know how some can give an answer to the purposed question if they have not played through these little gems...

    carry on...
     
  17. EADGBE

    EADGBE Well-Known Member

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    I believe the EL34s have more distortion at a lower volume so that's what I use.
     
  18. scozz

    scozz Well-Known Member

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    The more I read about amplifier power tubes and their differences, the more I see many who say they have a very small effect on the tone of an amplifier. Most articles that I've read on the subject say the tone difference between different types of power tubes is negligible.
     
  19. ken361

    ken361 Well-Known Member

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    Tungsols were tighter in the low end over the EH so I stuck the stocks back in. Found the crunch was better then JJ in the SV amp.
     
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  20. scozz

    scozz Well-Known Member

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    When you say "the crunch was better then JJ in the SV amp",....do you mean the quality of the crunch tone was better or that there was more crunch?
     

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