General Information

Serial #

N/A

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

GLASS/ METAL/ SYNTHETIC/ PAPER

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

12.3 cm

Width

3.8 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Vacuum Tubes

Category

Receiving

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

North America

State/Province

Unknown

Period

Unknown

Canada

Unknown

Function

USED AS A BIASED DETECTOR IN A-C RECEIVERS DESIGNED FOR ITS CHARACTERISTICS; ALSO AS A LOW SIGNAL-INPUT, SCREEN-GRID AMPLIFIER TUBE & AS AN AUTOMATIC VOLUME CONTROL TUBE

Technical

FIRST 2.5V R.F. PENTODE ALONG WITH 58 DEVELOPED IN THE U.S./ ALSO THESE TYPES WERE THE FIRST TO USE THE 'ST' STYLE DOMED BULBS - IN THIS STYLE OF CONSTRUCTION THE ELEMENT ASSEMBLY WAS BRACED AT ITS UPPER EDGE BY MICA SPACERS BEARING AGAINST THE NARROWER TOP SECTION OF THE BULB

Area Notes

Unknown

Details

Markings

ETCHED ON GLASS: '57/ DEM'/ PRINTED ON BASE: 'MADE FOR/ 'Westinghouse'/ PRINTED ON BOX INCLUDES: 'Westinghouse/ CANADIAN/ WESTINGHOUSE [LOGO]/ RADIOTRON/Micro-Sensitive/ radio tubes improve/ the performance/ of any radio set/ [GUARANTEE ON SIDE]/ RADIOTRON/ 57'

Missing

N/A

Finish

UNCOLOURED GLASS/ BLACK BASE WITH WHITE PRINTING/ RED & BLACK BOX

Decoration

N/A