Artifact Details

Title

Vacuum tube type 7AK7

Catalog Number

102735180

Type

Physical object

Date

1938 ca.

Manufacturer

Sylvania

Place Manufactured

U. S.

Identifying Numbers

Model number 7AK7 Printed in brown ink on top of the glass envelope.
Other number 20.FR.V2-1 Handwritten vertically in green ink on the glass envelope of one of the tubes.
Other number 67.FR.V2-1 Handwritten vertically in green ink on the glass envelope of one of the tubes.
Other number 8AR V-4 Handwritten in white ink around the glass envelope near the top of one of the tubes.
Other number AK1320 Handwritten in white ink around the glass envelope near the base of one of the tubes.
Other number AK2213 Handwritten in white ink around the glass envelope near the base of one of the tubes.

Dimensions

overall: 3 1/8 in x 1 1/4 in x 1 1/4 in

Description

There are 6 tubes covered by this record. This is a pentode vacuum tube with a loctal base. Pin 5 is missing by design. This is a spare tube for Bus Driver-Arithmetic Rack S/N 10. Five of the six tubes described in this have additional markings on their envelopes, as described above.

Category

Component/vacuum tube

Credit

Gift of the Digital Equipment Corporation

Lot Number

X115.82