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Original Message
1961Vacuum Tube Op-Amp
Posted by Tony Lauck on July 15, 2012 at 12:23:16:
This ia picture of a vacuum tube op-amp from the analog computer that I used in 1961. The link has a complete description of the system and more pictures. As a 17 year old kid, I really enjoyed twirling the 10 turn precision potentiometers. :-)