amps with 2 power tubes but only 1 preamp tube

Discussion in 'Amps and Cabs' started by jay24, May 5, 2016.

  1. jay24

    jay24 Supporting Member

    Messages:
    128
    Joined:
    Feb 22, 2008
    Location:
    New Jersey
    hey guys, I was looking at the Reeves Custom 12 and I noticed that it has two el84s but only uses one 12ax7 for the preamp and has a full t/m/b tone stack.

    Almost all the amps I've seen has more than one preamp tube. How does that work?

    Are there any disadvantages/advantages tonally and functionally to using only one preamp tube verses more?

    I do understand one tube is used for the phase inverter. Is that all you need to make a preamp section?

    Just curious how it worked and was hoping someone can explain to me simply, if there is a simple answer. Tried looking it up but couldn't find any answers. I did come across someone mentioning an amp had to be utilizing solid state components if it only has 1 preamp tube. Not sure if that's true or not.

    Thanks!
     
  2. diagrammatiks

    diagrammatiks Member

    Messages:
    3,028
    Joined:
    Jan 6, 2010
    It's a single ended amp no phase inverter.
     
    doctorx, RussB and slybird like this.
  3. slybird

    slybird Member

    Messages:
    6,024
    Joined:
    Feb 8, 2014
    The above is correct. Single ended amps do not have phase inverters. Phase inverters are needed for push/pull, but not for single ended.
     
  4. jay24

    jay24 Supporting Member

    Messages:
    128
    Joined:
    Feb 22, 2008
    Location:
    New Jersey
    ah okay, I understand now, that's what it meant when Reeves described the amp has having a parallel single ended design. Basically a single ended amp with two power tubes. Thanks for the info!
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice