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Help with NOS tubes (6L6/12AX7)..

Discussion in 'Amps and Cabs' started by coolhand78, Jan 10, 2008.

  1. coolhand78

    coolhand78 Supporting Member

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    which of these are 'better' (if you could say why they are better that would also be helpful)? they're a 64 vibroverb custom...

    1. JAN GE 12AX7WA or NOS RCA 12AX7A
    2. JAN Philips 7581A or NOS GE 6L6GC


    Thanks :NUTS
     
  2. chaz

    chaz Member

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    I like the second choice of each best, but it's all up to your ears in the end. I think the RCA's are a smoother, sweeter sounding tube, and if you like some breakup the GE's will give it up earlier than 7581's which are known for lots of headroom. Hope that helps.
     
  3. Blue Strat

    Blue Strat Member

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    Neither is "better". It's like asking if green or blue is better. It's a personal/subjective issue.
     
  4. coolhand78

    coolhand78 Supporting Member

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    I'll rephrase, how do they differ...? i.e.what are the benefits of each...
     
  5. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    Oh, come on Mike - everyone knows that green is the "Mullard" of the color spectrum. :D

    - T

    p.s. for what it is worth, I prefer the RCA 12AX7A to the GE 12AX7WA - the RCA has real fat, tight lows, somewhat scooped mids, and bright but somewhat indistinct treble. The GE also has good low end punch, but is a bit less dynamic than the RCA. Both tubes lack the clarity of many other (mostly older) 12AX7.
     
  6. Blue Strat

    Blue Strat Member

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    The JAN Philips 7581As will give the most clean headroom and would be brighter than the GE 6L6GCs.
     
  7. FloridaSam

    FloridaSam Member

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    I had an amp tech replace the tubes in a 1966 Super Reverb. He replaced the 6L6 with the 7581A. He said he would swap them with 6L6 if I didn't like tham but wanted me to try them first. I loved the JAN Phillips 7581a. They really worked in that amp. Like others have said, huge clean hedaroom from that amp.
     
  8. coolhand78

    coolhand78 Supporting Member

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    cool thanks for the replies...
    i think ill go with the RCA 12AX7A's and the 7581A's

    anyone know where i can get some matched 7581a's?

    cheers...
     
  9. Macaroni

    Macaroni Member

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    I have Phillips 7581As & RCA 6L6GCs, and while the 7581As have more clean headroom, they don't break up as nice, ie: the OD tones aren't as sweet, IMHO. That's the trade off. They do take pedals well though.
     
  10. P90Nut

    P90Nut Member

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    I am sure that Mike at KCA NOS Tubes can help you, or Doug's tubes.

    Good luck!


    Mark
     

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