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Electronic Valve - Philips, Triode - Hexode, Type ECH33, circa 1950 Object Reg. No: ST 035931

Summary:
Triode-hexode used as a frequency changer in superheterodyne radio receivers. Used in the post-World War Two (1939-1945) years up to about 1952.
6.3 V indirectly heated cathode.
This was the octal based version of the side contact type ECH3. It was equivalent to the ECH35 except for its heater current rating (200mA versus 300mA for the ECH35)

Manufactured for: Philips, Holland
Manufacturer: Mullard, England
Description:
Shouldered red sprayed glass bulb with top cap and octal base
Acquisition Information:
Donation from Mrs M. Kennedy
Discipline: Technology
Dimensions: 110 mm (Length), 35 mm (Diameter)

More information

Tagged with: thermionic electron valves
Themes this item is part of: Engineering Collection, Information & Communication Collection
Primary Classification: ELECTRONICS
Secondary Classification: Vacuum Technology
Tertiary Classification: frequency changing
Inscriptions: Bulb: ECH33/MADE IN/GREAT BRITAIN
Base: PHILIPS/Miniwatt/1041/1H3
Manufactured For: Philips, Holland, circa 1950
Manufacturer: Mullard, England, circa 1950

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