Best AT7 for reverb driver?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by jzucker, Feb 21, 2008.

  1. jzucker

    jzucker Supporting Member

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    What's the best current production and best NOS tube for this application? Seems like a lot of the current production tubes can't handle the voltage in a fender style circuit...
     
  2. Dave

    Dave Member

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    Don't know if they're the best, but KCA sells NOS Mullards for $26. I like 'em.
     
  3. Bonenut

    Bonenut Member

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    I pretty much stick with plain old RCA 12AT7's screened for noise. Can't go wrong with the Mully 4024 though.
     
  4. slider313

    slider313 Silver Supporting Member

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    I like the GE 6201/12AT7WA. You have to buy them tested, in the reverb circuit, because some are microphonic or noisey. I also like them in the phase inverter for a warmer tone. The RCA 6679 is also a good choice for the reverb send.
     
  5. Blue Strat

    Blue Strat Member

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    These are a bad choice for a Fender reverb driver. Many don't hold up to the abuse.

    The Mullard CV4024 and RCA 12AT7s are perennial favorites.:BEER
     
  6. jzucker

    jzucker Supporting Member

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    any new production at7s work in the reverb driver?
     
  7. Blue Strat

    Blue Strat Member

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    You can get a NOS JAN Philips 12AT7 for $12. It seems pointless to me to save $2 and use a piece of garbage.
     
  8. jzucker

    jzucker Supporting Member

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    I need to order some of these from you Mike. Is there as good a bargain in ax7 tubes as well?
     
  9. Blue Strat

    Blue Strat Member

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    Not in NOS 12AX7s. Best deal in American made 12AX7s would be ANOS (lightly used) RCA 12AX7As at $40 a pop. These will still likely outlast new production $10 tubes by 4:1.

    Best be in new production 12AX7s are the Tung Sol Reissues ($15 each).
     
  10. Wakarusa

    Wakarusa Member

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    I've been telling folks for years (and practicing what I preach): For a Fender reverb driver the best choice by far has been a JAN/Philips 12AT7WC.

    They sound just fine for this application, will take the abuse for years, are still plentiful, and in many cases are cheaper than new production.
     
  11. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    There is no best 12AT7.

    My favorite is:
    Mullard CV4024 ('80s, for darker, rich, smooth, fat bass)
    Mullard ECC81 ('50s square-getter, bright and clear)
    Ken-Rad black-plate early-'50s (most clear ever, dynamic, later break-up)
    RCA black-plate mid-'50s (lively and bright, great dynamic break-up)
    Raytheon black-plate early-'60s dark, rounded highs, tight bass)

    Depending upon the amp, and position.

    - Thom
     
  12. Blue Strat

    Blue Strat Member

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    I wouldn't say "best", maybe "best price/performance ratio" though. ;)
     
  13. Wakarusa

    Wakarusa Member

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    I should have been more clear: "best" is my opinion when trying to minimize price and maximize performance/durability.
     
  14. James Knox

    James Knox Member

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    I am using the Mullard CV4024's from Mike at KCA in 2 different Princeton Reverbs and they sound great - I have been very happy with them!

    Peace,

    James
     
  15. Axekisser

    Axekisser Member

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    I found some NOS Sylvania AT7's at a local hospital and tried it in my '68 PR. Seems to be working and actually seems quieter that the RCA that was in there. I guess time will tell how it holds up!
     
  16. Blue Strat

    Blue Strat Member

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    Congrats! Regarding noise, ANY tube can be noisy. It has nothing to do with one brand or another.
     
  17. Tomo

    Tomo Member

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    I love what you suggested tubes for me. Thanks for your help Mike!

    And you sounded really funky on E funk!


    Tomo
     
  18. jetlag

    jetlag Member

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    While I love the quality of the Mullard CV4024s and their warm tone, when I A-B'd stuff in a couple of BF fenders in the reverb driver and (to a lesser degree in the phase inverter), I prefered NOS USA stuff. They just seemed to sound more "right" to my ears for BF stuff in those circuits. The greyplate RCA 12AT7s are really nice sounding, but a little softer and warmer sounding than most USA 12AT7 types. Great from warming up or vibing out a stiff or bright blackface amp. But if your amp is already pretty warm sounding, I really like some of the other USA 12AT7s better - like sylvania, GE or Philips stuff (Mike, thanks for the warning on the GEs in the reverb driver, I'll watch that). I agree, it makes no sense to use current production 12At7s at this point in time.
     
  19. Steve Dallas

    Steve Dallas Supporting Member

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    +1 on JAN Phillips or JAN GE. I bought a couple dozen of them for $7 each last year.

    Current production tubes seem to last weeks in that position. I've had a JAN Phillips in there for a year now with no signs of crapping out. I expect it to last another 4 to 5 years.
     
  20. Sweet T

    Sweet T Member

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    I've been using the JAN-Philips 12AT7 as the Reverb Driver and the Mullard as the Phase inverter with much success.
     

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