Favorite V2 12AX7 in Super Reverb?

Discussion in 'Amps and Cabs' started by Tylenol Jones, Apr 12, 2015.

  1. Tylenol Jones

    Tylenol Jones Member

    Messages:
    2,373
    Joined:
    Nov 12, 2014
    Only play the 2nd channel, hence why no V1 tube at all. Which tube in the V2 slot do you prefer the most?

    RCA black plate? Grey plate? Mullard NOS?

    Personally, I tend to prefer a nice early breakup, seeing as how those amps are already so loud. Think SRV.

    This will be interesting for sure... :)
     
  2. Muzzy

    Muzzy Supporting Member

    Messages:
    2,579
    Joined:
    Jan 13, 2008
    Location:
    Western, MA.
    Jan GE 5751.
     
  3. wgs1230

    wgs1230 Fully Intonatable Silver Supporting Member

    Messages:
    2,375
    Joined:
    Nov 10, 2005
    Location:
    On The Bus
    RCA Black is the first choice, especially if you're loading up the cathode by pulling V1.

    Two other tricks for earlier breakup:
    1. If you don't use the tremolo, unsolder the hot lead from the intensity pot and tape it off. Easily reversible, and if you hit the input with a hot clean signal and you'll hear the before/after difference immediately.

    2. Re-deploy the ground lift switch to select another 820k NFB resistor in series with the stock resistor. This halves the amount of NFB leakage for more harmonic content. Again, not major surgery and the stock sound is there on the other side of the switch.
     
  4. fezz parka

    fezz parka Member

    Messages:
    879
    Joined:
    Nov 25, 2009
    Location:
    The Land that Time Forgot
    Yup. :D
     
  5. Tylenol Jones

    Tylenol Jones Member

    Messages:
    2,373
    Joined:
    Nov 12, 2014
    What's the tonal difference between the GE and RCA? :)
     
  6. Dashface

    Dashface Member

    Messages:
    3,907
    Joined:
    Jun 25, 2007
    Location:
    Victoria BC
    I've been running old Mullards "borrowed" from my Hiwatts in my Super Reverb, Bandmaster, and Deluxe amps... I can't say that they break up earlier, but they sure do sound sweet.
     
  7. metz420

    metz420 Silver Supporting Member

    Messages:
    446
    Joined:
    Jul 14, 2008
    Location:
    Fort Collins, CO
    You can also squeeze a little more gain by swapping the phase inverter tube to a 12AX7 (use the one pulled from v1 if you don't have a spare).
     
  8. bigben55

    bigben55 Member

    Messages:
    1,456
    Joined:
    Dec 24, 2010
    RCA 7025 won the job in my 1966.

    And that JAN GE 5751 won the PI spot (v6).
     
    Timbre Wolf likes this.
  9. Figaro

    Figaro Supporting Member

    Messages:
    9,667
    Joined:
    Dec 17, 2010
    Location:
    Sweet Carolina
    RCA 7025.
     
    Timbre Wolf likes this.
  10. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

    Messages:
    8,779
    Joined:
    Oct 14, 2005
    Location:
    Berkeley, CA
    The RCA 7025 (short-plate) would be my first choice, for the classic sound. That older black-plate RCA would break up earlier than the short-plate 7025. I expect I'd prefer a mid-'50s Sylvania short black-plate 12AX7 over the black-plate RCA 12AX7, for an earlier-breakup 12AX7 choice that retains clarity.

    Personally, I would not advise changing the PI from 12AT7 to 12AX7. It sort of gives an earlier breakup quality, but I don't like the way it changes the feel.

    - Thom
     
    dsmc80 and Bob Pollock like this.
  11. Bob Pollock

    Bob Pollock Supporting Member

    Messages:
    4,223
    Joined:
    Dec 29, 2007
    Location:
    Drifting the High Plains
    Have to agree with Timbre Wolf regarding a 12AX7 in the PI, kind of ugly sounding to me.
     
    dsmc80 likes this.

Share This Page