Another of John R. Pierce's articles up on the website... My Work With Vacuum Tubes At Bell Laboratories By John R. Pierce (c) (Reprinted from SMEC (now SMECC) "Vintage Electrics" Volume #3 issue #1 - 1991) http://www.smecc.org/john_r__pierce____electron_tubes.htm (click to go there) Ed Sharpe Archivist for SMECC see the museum at: http://www.smecc.org