Tube Option for Reverb (Twin Reverb)

Discussion in 'Amps and Cabs' started by stevel, Apr 8, 2015.

  1. stevel

    stevel Member

    Messages:
    12,955
    Joined:
    Apr 6, 2008
    Location:
    Hampton Roads, Virginia
    Will using a different tube (or tubes) for the Reverb make a difference in the way the reverb sounds in a Twin Reverb.

    If so, will it also affect the general tone?

    Additionally, if different tubes create different reverb characteristics, are there any predictable changes.

    I think I've read you use something like an AT or AU or something instead of an AX (or whatever it is) to make the reverb onset different. For example, right now my reverb is basically off until I get to right before 2 on the dial, and after about 2.5 I'm firmly in surf territory.

    It would be nice to have a "wider spread" - so say what happens from 2 to 2.5 now goes from say 1 to 5 or so instead.

    I don't have a problem with the tone or the depth of the reverb per se but I've heard Deluxe Reverbs with a "swimmier" (surfier - more like the 63 stand alone tanks) verb - would any tube swaps help?

    Also, I was using verb on the amp, and boosting the volume into the amp (which on a TR just gets louder). When I had this louder volume going into the amp (from an output knob on a pedal board let's say) it seemed to "smack" the reverb in way that I found unpleasant. So again I'm wondering if any tube swaps could help, pardon the pun, rectify that.

    Finally, I might ultimately consider swapping out the reverb tank if that could make a difference. But I guess what I want to know is if stock tanks are generally hit and miss - you may get an awesome sounding on, or you may not - or if they all do pretty much sound the same (within a reasonable range).

    I'm sure there are manufacturers out there who make replacement tanks.

    But I guess if the tube plays a bigger role in the overall - response - that's the word I'm looking for - the response of the verb, that would be the obvious place to start.
     
  2. Heady Jam Fan

    Heady Jam Fan Member

    Messages:
    8,924
    Joined:
    Nov 30, 2010
    Location:
    Pittsburgh
    Do yourself a favor and get an RCA Long Plate 12AU7. I have some black plates and some clear tops and they are killer. Far more rich sounding than other tubes. I got them for $10 each, I have probably 15 of them. I have some GE black plate 12AU7's too - they sound good, but not as deep and natural.
     
  3. zenas

    zenas Member

    Messages:
    5,988
    Joined:
    Jul 1, 2011
    I run organ pull 12au7s for reverb drivers. Pickup a few free organs and the 12AU7s pile up.

    I can't tell the diffierence between the Hammond, Conn, Baldwin or whatever they all sound the same to me.
     
  4. J M Fahey

    J M Fahey Member

    Messages:
    2,162
    Joined:
    May 22, 2009
    Maybe there's a reason Leo used 12AT7 for decades, don't you think? ;)

    Fact is they have an adequate balance between output current and ease of drive.

    12AX are more sensible but have less current capability, so they are a poor choice.

    12AU have far higher current capability and in a circuit designed for them they will do very well; plugging then in a circuit meant for 12AT they will work poorly, both because their current capability is not properly exploited (you are not changing the drive transformer) and biasing is horrible.

    And anyway, sound is more in the project itself than in "parts".
     
  5. zenas

    zenas Member

    Messages:
    5,988
    Joined:
    Jul 1, 2011
    Well they work fine on this side of the eqautor. :)
     
  6. jonnytexas

    jonnytexas Supporting Member

    Messages:
    3,276
    Joined:
    Apr 23, 2014
    Location:
    Houston
    I HAD the exact same problem with my Super Reverb until I posted the same question. The surf was too much, but I love the lushness. Mike from KCA NOS suggested a raytheon 12au7 and it made a HUGE difference. Now there is actually a usable range. I would start with a tube change, as that did it for me.
     
  7. stevel

    stevel Member

    Messages:
    12,955
    Joined:
    Apr 6, 2008
    Location:
    Hampton Roads, Virginia
    So this would be V3, correct?
     
  8. BigPapiFan

    BigPapiFan Member

    Messages:
    2,215
    Joined:
    May 16, 2007
    Location:
    Albany, NY
    A Mullard CV 4024 or an RCA 12AT7 sounds great in V3.
     
  9. jonnytexas

    jonnytexas Supporting Member

    Messages:
    3,276
    Joined:
    Apr 23, 2014
    Location:
    Houston
    Yeah, a 12au7 for the 12at7. Made a huge difference. I love my super, that surfy reverb was its achilles heel. The tube change made a dramatic difference. Do it.
     
  10. DaveKS

    DaveKS Member

    Messages:
    15,893
    Joined:
    Feb 26, 2013
    Location:
    KS
  11. Joe L

    Joe L Supporting Member

    Messages:
    1,159
    Joined:
    Dec 28, 2009
    Location:
    White Plains,New York
    if the reverb comes on too strong , too fast, put a tapered pot on the reverb. That will help to dial in reverb more evenly and slowly.
     
  12. Roe

    Roe Member

    Messages:
    6,940
    Joined:
    Jul 12, 2005
    Location:
    tromsoe, norway
    + 1 on this (and v6 as well)
     
  13. swiveltung

    swiveltung Member

    Messages:
    14,566
    Joined:
    Feb 5, 2011
    Location:
    PNW
    A tube will make a difference... but not so much in control. Fender reverbs are famous for being off at 2 and sound full on at 3.5. There is a mod you can do to replace the pot with a lower value and add a resistor... ( I think I've got that right) This gives you the reverb range that is normally 0-5 but spreads it over 0-10 giving you more control.
     
  14. The Dirty Tube

    The Dirty Tube Member

    Messages:
    1,633
    Joined:
    Aug 14, 2012
    Location:
    A Child's Garden of Glass
    Also check out the 5965 tube.

    It's an industrial type similar to a 12AV7. It's a lower gain factor than a 12AT7, but not nearly as low as a 12AU7.
     

Share This Page