Artifact Details

Title

Vacuum tube type 7AK7

Catalog Number

102732440

Type

Physical object

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

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.

Category

Component/vacuum tube