Artifact Details


Whirlwind vacuum tube module PS

Catalog Number



Physical object



Identifying Numbers

Serial number 4 Stamped in white ink between the vacuum tubes.


overall: 5 1/4 in x 1 5/8 in x 9 1/2 in


This plug-in module is formed by an open chassis on three sides and a Bakelite plug with 24 flat contacts on the fourth side. A handle is attached on the end of the chassis opposite the connector. A flange on each side holds a captive screw used for securing the module into one of the positions of the ten-module rack.

Two 8-pin loctal vacuum tube sockets are mounted on the same end as the handle. Two pairs of phenolic solder terminal strips span the space between the two sides of the chassis to which passive components are soldered. Point-to-point wiring connects the connector, the tube socket pins,and the solder terminal strips.

The tube complement is two 6145.

An index card, on which "NR3138 - Box 4 - #7 2 FF MOD IV" is written in red ball point pen, is Scotch-taped to one of the open sides. A yellow tag is attached by a string to the handle of the module that has information about why the module was removed ("Low output") written in pencil.




Gift of Compaq Computer Corporation

Lot Number