Vacuum tube

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Ingenium, 1986.0791.001
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OBJECT TYPE: BROADCASTING/WATER-COOLED
DATE: 1935–1970
ARTIFACT NUMBER: 1986.0791.001

MANUFACTURER: MACHLETT LABORATORIES INC.
MODEL: ML298A
LOCATION: United States of America

More Information

General Information

Serial #: 445959
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: GLASS ENVELOPES AT EACH END OF WATER JACKET, METAL PLATE, PROBABLY TANTALUM INTERNAL GRID STRUCTURE AND 35 AMP 26 VOLT HEATER (FILAMENT)/ WOOD STORAGE CRATE/ METAL SUPPORTS

Dimensions

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

Length: 52.0 cm
Width: 42.0 cm
Height: 550.0 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: MACHLETT
Country: United States of America
State/Province: Unknown
City: Unknown

Context

Country: North America
State/Province: Unknown
Period: 1935 THROUGH 1975 (SEE COMMENTS)
Canada: USED IN CBC'S FIRST HIGH POWER STATION CBL IN HORNBY, ON ACCORDING TO DONOR'S DISPLAY INFORMATION
Function: USED AS A FINAL RADIO FREQUENCY AMPLIFIER TUBE IN A HIGH POWER BROADCAST TRANSMITTER (50000 WATTS)
Technical: CBL WAS ONE OF THE FIRST, IF NOT THE FIRST, 50000 WATT BROADCAST TRANSMITTERS INSTALLED INCANADA/ ALSO, IT USED A PHASING SYSTEM TO PRODUCE AMPLITUDE MODULATION RATHER THATN THE NORMAL HIGH LEVEL PLATE MODULATION THAT REQUIRED A 30000 WATT AUDIO MODULATOR
Area Notes: Unknown

Details

Markings: PLATE: 'ML-298A/ MACHLETT LABORATORIES, INC./ SERIAL NO. 445959/ MADE IN U.S.A.'/ PRINTED ON SLEEVE: '26.5 FILAMENT VOLTS/ FOR/ 35 AMPERES/ EMISSION' STAMPED 4 TIMES: '61'/ ENGRAVED ON INNER SLEEVE: '445959'
Missing: N/A
Finish: ENVELOPES, UNCOLOURED GLASS/ WATER JACKET, GRAY/ CONNECTIONS, DARK BROWN
Decoration: N/A

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MACHLETT LABORATORIES INC., Vacuum tube, circa 1935–1970, Artifact no. 1986.0791, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1986.0791.001/

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