Artifact Details

Title

Johnniac Selectron Tube

Catalog Number

X281.83

Type

Physical object

Date

1953

Manufacturer

Radio Corporation of America (RCA)

Place Manufactured

U.S.

Identifying Numbers

Model number Johnniac
Serial number c7761A-T11 VT6827

Dimensions

3 x 9 x 3 in.

Description

One of the forty RCA Selectron tubes installed on the Rand Corporation Johnniac Computer in 1950. The tubes constituted the 256-word, 40-bit memory. In 1954 a 4000-word magnetic core memory replaced the tubes.

Category

Memory: electrostatic

Subject

mechanical; Electronic; Vacuum tube

Credit

Gift of Fred Gruenberger

Lot Number

X281.83