El-Tronics Model DS 7A "Classroom Demonstrator" (1952-1955)

El-Tronics Model DS-7A Classroom Demonstrator

"A classroom demonstrator for use with Geiger tubes to demonstrate the properties of radioactivity by both visual and audible methods" according to the Atomic Energy Commission Radiation Instrument Catalog.

A radioactive sample was included with the instrument but it is missing in this example.

The earlier version of this instrument, the Model DS-7, only indicated the count rate via a neon light and a speaker. There was no display indicating the count rate in cpm.

Detector Side-wall GM tube in external probe

Display: Indicates count rate in cpm and the applied high voltage in kilovolts

Range: 0-200, 0-2000 cpm

High Voltage Supply: up to 1000 volts

Output: speaker and neon light

Size: 9.5” x 7” x 9.5”

Weight: 16 pounds

Kindly donated in memory of Syd Porter.


AEC Radiation Instrument Catalog No. 3. Page MGM-24B. July 1, 1952.