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Valve complement of the original Williamson amplifier was determined by scarce supply in wartime Britain. The two suitable and available output valves were either the PX25 triode, or a triode-connected KT66 beam tetrode. [24] Williamson initially used the PX25, an already obsolete directly-heated triode introduced in 1932.
Originally, Sovtek guitar amplifier valves were claimed to have been descendants of earlier wartime Russian-made components and carried blast proof capabilities. This, however, was later dispelled as urban myth, attributed to a sales person who promoted early product at music industry trade shows worldwide [ citation needed ] .
Valves with high g m thus tend to have lower noise at high frequencies. In the audio frequency range (below 1–100 kHz), "1/f" noise becomes dominant, which rises like 1/f. Thus, valves with low noise at high frequency do not necessarily have low noise in the audio frequency range.
In 1953, the starting year for introduction of a transistor line began with engineering samples. Early in 1954, a transistor line was produced with the DR-XXX transistor available with limited tech information. Officially, sometime later Tung-Sol released the DR-150, a 5-watt output device of the germanium type.
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A person was arrested after attempting to climb a temporary fence near the White House this morning, according to a U.S. Secret Service spokesperson. The Secret Service said the person was ...
Russia said Friday it had arrested suspected members of a Colombian cartel trying to smuggle tens of millions of dollars worth of cocaine into Europe.. The suspects were caught loading 570 ...
The Alfa Romeo 115 is an Italian six-cylinder air-cooled inverted inline engine for aircraft use, mainly for training and light planes, based on the de Havilland Gipsy Six engine. Production totalled approximately 1,600 units. Derivatives of the 115 include the -1, bis, ter and Alfa Romeo 116. [1]