General Information

Serial #

304001

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Metal/ Glass/ Synthetic

Dimensions

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

Length

88.9 cm

Width

88.9 cm

Height

119.4 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Vacuum Tubes

Category

Transmitting

Sub-Category

N/A

Manufacturer

AKA

General Electric

Country

United States of America

State/Province

Unknown

City

Unknown

Context

Country

North America

State/Province

Unknown

Period

1953-1963

Canada

Used by CBC Toronto (CBL-AM) for radio broadcast transmission.

Function

Used by the CBC in radio broadcast transmitting.

Technical

Example of an air cooled, high power radio transmission tube. Two or more of these would have been used in a typical transmitter installation. Radio station CBL (Toronto) transmitted at 840 KHz on the AM band with a power output of 50 kW. Such tubes are large because the high input voltages require greater spacing between the tube elements to prevent arcing. In addition, to achieve the high power output a larger and hotter filament (or cathode) is needed. Due to the resulting requirement for greater heat dissipation in the other tube elements, the manufacturer must provide for supplementary cooling. In this tube, cooling is accomplished by means of radial fins made of sheet metal.

Area Notes

Unknown

Details

Markings

Paper tag tied to left handle reads: "GL-895-R/ G.E. (U.S.A.)./ L.H. Mod. Service./ Total Hrs.: 42,815./ Removed from Circuit/ June10,'63./ H.A.Ro.[letters 'Ro' are signed in cursive overtop typed lettering 'H.A.Ro.']/ "Low emission."/ #304001." Paper label on shipping crate reads: "TO [followed by an arrow] C.B.C. technical stores./ (Archive)/ 1425 argyle street/ Montreal. P.Q./ATTENTION [followed by an arrow] Mr. Norm Holding/ FROM [followed by an arrow] CBM transmitter. Marieville." Markings stencilled on glass tube reads: "GENERAL [logo] ELECTRIC/ GL-895R/ MADE IN U.S.A." Mfr's plate affixed to metal base of tube reads: "[logo]/ MADE IN U.S.A./ N.P. 83631" Inscription on metal rim inside glass tube reads: "895R 304 001"

Missing

N/A

Finish

Unknown

Decoration

N/A