Class A vs Tube preamp

Discussion in 'Amps and Cabs [BG]' started by Yamarc, Jan 13, 2003.

  1. Yamarc

    Yamarc Supporting Member

    Jun 25, 2002
    Northville, MI
    What is the difference between a class A preamp and a tube preamp? I guess my question is...what is a class A preamp and what does it do/sound like? I think my Avalon U5 is a class A pre, do they make a preamp that has both? Thanks
  2. ajovanov


    Sep 5, 2000
    I think that Class A has to do with the voltage
    and other operating parameters with the amp electronics
  3. geshel


    Oct 2, 2001
    Class A is a type of circuit design, which can apply to tube or solid-state. In it, the output device is generally always on w/ a good deal of idle current, meaning they run hot and are less efficient than other (class B, AB, H, D, etc) designs. It might sound better though. AB is most common. There have been a couple threads about the amp types here in the past year, try your luck searching for one.