During the mid-1920s, Amplifying vacuum tubes ( US ) / thermionic valves ( UK ) revolutionized radio receivers and transmitters.
12.
RP-21 featured a mechanically steered and gyroscopic stabilised radar dish, and had a thermionic valve ( vacuum tube ) circuit.
13.
During the mid-1920s, amplifying vacuum tubes ( or " thermionic valves " in the UK ) revolutionized radio receivers and transmitters.
14.
Such memory contrasted sharply with memory based on active electronic devices, originally tube ( or thermionic valve ) based DRAM ).
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A "'suppressor grid "'is a grid used in a thermionic valve ( also called vacuum tube ) to suppress secondary emission.
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The "'EMI 2001 Broadcast studio camera "'was an early, very successful British made thermionic valves in the first generation of the design.
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In 1926 he employed his electronics skills to construct an amplifier using thermionic valves ( vacuum tubes ) for very small electrical currents.
18.
Magnum sets from the E301 to the 3AS1691, with their wooden cases, thermionic valve and braille dial markings were issued between 1939 and 1943.
19.
The fast drum rotated at 1, 725 thermionic valves ( vacuum tubes ) & mdash; mostly thyratrons & mdash; for the high speed circuits.
20.
Schreyer was not and continued working on his pet project, the thermionic valve, which could be used both as a memory device and as a switching mechanism.
