Philbrick? - test-drb@ccmp.vtda.org

12 Oct 2001

 John Allain wrote:
...
  While cleaning up some garage space (yes, so a Car
could
 go in there)  I came across a cache of some things I knew I
 had and one thing I forgot.
 A 2 tube module.from George A. Philbrick Researches Inc. 
 It's a GAP/R K2-W with "computor" tubes in it.

 Before anybody vomits (as regards computor) could 
 somebody remind me who Philbrick was?
 The name seems familliar.              TIA 

1946 George A. Philbrick Researches Inc. (GAP/R) founded
     by George Arthur Philbrick, electronic analog computer
     pioneer. The company produced many innovating electronic
     analog computer designs. During the 50's and early 60's 
     they had the opamp market pretty much all sewn up.
1966 Merged into Teledyne Philbrick Nexus,
     Which became Teledyne Philbrick,
     Which became Teledyne Components,
1993 Became TelCom Semiconductor.

  The K2-W was the first commercially available opamp.
Open loop gain of 15,000. Power requirements are 4.5 ma
at +300VDC and -300 VDC, and .6 amp at 6.3 volts AC or DC
(tube heaters). Input and output voltage range -50VDC to
+50VDC. Input current is less than .1ua.
 Early ones had a case of brown bakelite, later ones had
a grey plastic case. 
 I can send you a data sheet.
 Regards,
 --Doug
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Doug Coward                
@ home in Poulsbo, WA

Analog Computer Online Museum and History Center
http://www.best.com/~dcoward/analog
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