TUBE Facts and Info by MartyStrat54

Discussion in 'The Workbench' started by MartyStrat54, May 6, 2011.

  1. BowerR64

    BowerR64 Well-Known Member

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    Is there anyway to find out what all the numbers mean after the main model of the tube?

    Like say 6L6GC or 6L6EH?

    I thought they were just like date codes or something but i read something that makes me thing they are something else.
     
  2. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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    Ha. The meanings vary unless you know history.

    The EH is Electro Harmonix which means nothing except that they manufactured the 6L6.

    A GC however is a historical design designation. The GC was the last 6L6 design with the only post design being military 7581 types.

    The 6L6EH is a copy of a Russian design and is no RCA 6L6GC black plate although they claim it to be similar.
     
  3. Riffraff

    Riffraff Well-Known Member

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    One is etched B0H and the other two are etched B0I.
     
  4. GIBSON67

    GIBSON67 Well-Known Member

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    1960 so those should be I61's.
     
  5. Riffraff

    Riffraff Well-Known Member

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    Cool, That's what I was hoping they would be. :dude:
     
  6. southbound suarez

    southbound suarez Member

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    What makes them cool is the fact that you dig the way that they sound! Of course, other factors can influence your judgement , such as brand, demand and popularity, price paid and current elitist statistical trends!
    I know I have found myself influenced by similiar mass hysteria.....
     
    Last edited: Oct 1, 2016
  7. kev67

    kev67 Member

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  8. Raiders757

    Raiders757 New Member

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    Maybe this isn't the right place to ask, and sorry if it is, but what little I have read in this thread is very informative.

    I've been playing guitar since 1980 (other than the recent five year hiatus I just came off of), and have always been a solid state guy. Having spent the past few months banging the rust off, I decided to buy my first tube amp. I figured instead of buying a tube head for my 4x12, that I would start with an upgrade over the little practice amp I had been using, so I got a used Haze 40. It sounds great, but I have noticed a few issues, being that it's used. I figured I would start with a tube upgrade.

    I've been looking at this kit to get me started. https://www.amazon.com/dp/B00VAK94C...TF8&colid=1GK997VSOPCJ1&coliid=I3QEDG8PJZGGWG

    ...also this one. https://www.amazon.com/dp/B015YJ4P6...TF8&colid=1GK997VSOPCJ1&coliid=I2Y2BJJ9GOU6FA

    ...and this one as well. https://www.amazon.com/dp/B00VH5DYS...TF8&colid=1GK997VSOPCJ1&coliid=I3S34DQ0TH1J1P

    I am just curious, which set you guys would recommend. it feels very strange being a N00B at something when it comes to guitars and amps, but like I said, tube amps are an entirely new ballgame for me

    Thanks to anyone who can help me, and sorry, if this was the wrong place to post this. I just figured this is a subject that gets asked often, and this board might not need another thread asking the same. Cheers!
     
  9. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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  10. Raiders757

    Raiders757 New Member

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    Thank for the quick response. I'll go read the threads you linked and see if they help. \m/ \m/
     
  11. Riffraff

    Riffraff Well-Known Member

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    Major score the other day....

    [​IMG]

    [​IMG]

    One of the best sounding EL34's ever made. I picked up this used pair fully tested with >80% life left in them for my Plexi modded YBA-1.

    [​IMG]

    The faded Amperex Bugle Boy logo.

    [​IMG]
     
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  12. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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    That is nice.

    Let us know how they bias up and sound.
     
  13. BadgerO

    BadgerO Active Member

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    Buying tubes is good practice in my opinion, keeps the supply flowing. I stockpile other components as well.
     
  14. Joe6BG6GA

    Joe6BG6GA New Member

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    Greetings to all In regard to Marshall Majors, I recommend Sylvania 12AU7WB for the driver, before the KT88s. Have ran across several Majors with 12AT7s here; not good. This is a low impedance driver stage, and the Sylvania tubes will give a good life here. It's good to be back on the Forum..so far I'm still cancer free
     
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  15. thescunner

    thescunner New Member

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    Hi, could you please answer a novice's question regarding valves positions on my 1999 dsl 100 head? I've read so much on this forum about dsl amps and all very informative but how do I identify the V1,V2 sockets etc? Would I be right in assuming it's left to right when viewed from the rear of the amp? Obviously I don't want to any damage when experimenting with new valves. Regards
     
  16. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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    Hello Scunner.
    Have a look.
    http://www.marshallforum.com/threads/dsl-100-head-preamp-tube-layout.11370/
     
  17. thescunner

    thescunner New Member

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    Hey, thank you for the response and the info, I guess the a & b refer to the channel the tube will affect? Regards
     
    Last edited: Oct 4, 2017
  18. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    most pre-amp tubes are a dual-triode. That means that there are 2- triode tube sets in a single tube. Just like a dual monoblock amp, each triode is independent of each other. So, in an amp, they will sometimes specify what each ½ is doing. so, on V1 (valve 1), each ½ will be indicated as a/b. a, being the 1st triode & b, being the 2nd triode.
     
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  19. thescunner

    thescunner New Member

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    Thanks guys, makes perfect sense now.
     
  20. thescunner

    thescunner New Member

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    Hi, I wonder if any of you guys are using JJ EL34L tubes in a dsl 100? If so, are you biasing to the Marshall spec 90 mv?
     

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