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The 150T was first Eimac tube, advertised in QST in 1934 and was exhibited at the ARRL Convention 1934 in Sacramento. After that the tube was produced in series.
Shortly after the 150T followed the 50T, 300T and 500T, later in the 30ies followed the 35T, 100T, 1500T and 2000T. The number is the plate dissipation a tube was made for. If a tube tested had far ecxceeded the original ratings, they were numbered higher: 50T = 100T, 150T = 250T, 300T = 450T, 500T = 750T but the 35T, 100T and 2000T retained their original numbers and ratings. Later a distinction with TL or HL followed. Thus the 35T, 100T, 250T, 450T and the 750T became the 35TL, 100TL, 250TL, 450TL and 750TL.
100T was used in the transmitter of the Pre-XAF radar prototype installed in April 1937 aboard of the USS Leary destroyer. Six tubes in a ring oscillator pulsed at 8 kV gave about 50 kW at 200 MHz. In December 1938 a second XAF prototype redesigned for the specific warship environment was installed on the USS New York.
The electrode pack of 100T was then repackaged in all-glass bulbs to better operate at 200 MHz, originating the 100TS (VT-127). 100T was also used in the modulator section of other radar sets, as the CXAS.
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