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Artifact Details

Title

Vacuum tube type 7AK7

Catalog Number

102732440

Type

Physical object

Description

This is a pentode tube enclosed in a glass envelope with a loctal base. Pin 5 is missing by design. This tube type was specially designed for long life, originally for use in the Whirlwind project. This is from the Boston Tube Exhibit of 1998, and includes a brief description.

Date

1938 ca.

Manufacturer

Sylvania

Place Manufactured

U. S.

Identifying Numbers

Model number	7AK7	Printed with silver ink on top of the glass envelope.
Other number	4 V9-1BR	Handwritten with silver ink around the glass envelope.

Dimensions

overall: 3 in x 1 1/4 in x 1 1/4 in