Artifact Details

Title

Whirlwind 305 step counter

Catalog Number

102732048

Type

Physical object

Date

1951

Manufacturer

Massachusetts Institute of Technology (MIT)

Identifying Numbers

Model number 305 Black label rear lower right
Other number C15-3 White gummed label rear lower right
Serial number 1 Black label rear lower right

Dimensions

overall: 53 1/2 in x 26 1/2 in x 8 in

Description

Object is a large panel bearing sockets for 53 vacuum tubes (36 populated). Engraved front top center and on a label on the rear lower right is "305 STEP COUNTER SERIAL #1". Around the perimeter of the front are 49 BNC connectors. Each has an engraved functional label on both front and back of the panel, some examples being "J-809 DIVIDE IN", "J806 SHIFT LEFT OUT", "J103 TEST RESET". There is a 29-pin male connector lower left. The rear supports a number of phenolic circuit boards elaborately wired with resistors and capacitors. At the top rear is a row of 12 clear pilot lights.

A paper label on the front reads "NR3703 - BOX 1 - #6". However, the object matches in every respect the photograph hand-labeled "NR3703, Box 1, #4"

Category

Component/module

Credit

Gift of the Digital Equipment Corporation

Lot Number

X115.82