pre·am·pli·fi·er 
(prē-ămplə-fī′ər)
(prē-ămplə-fī′ər)n.
An electronic circuit or device that detects and strengthens weak signals, as from a radio receiver, for subsequent, more powerful amplification stages.
- pullback
- pull chain
- pull date
- pull down
- pull-down menu
- pulldown menu
- puller
- pullet
- pulley
- pull in
- pullin horns
- pullin one's horns
- pull leg
- pullman
- Pullman
- Pullman
- pull off
- pull-on
- pull (oneself) together
- pull oneself together
- pull (one's) punches
- pull one's punches
- pull (one's) weight
- pull one's weight
- pullorum disease