Revision as of 14:09, 19 February 2011 by Kurt(talk | contribs)(New page: The Tektronix 121 is a wideband preamplifier intended for 511 scopes. * [http://bama.edebris.com/download/tek/121/tek%20121.pdf Tektronix 121 Manual (PDF)] <gallery> Image:Tek 121.jp...)