![]() ![]() Electro-Optical attenuator cell: T4A (opto cell is changed to T4B starting around number 1640).Input Transformer: UTC HA-100X (Input Transformer is changed to UTC A-10 starting around number 1640).Compress/Limit Switch: On rear panel of unit.on lower portion (later units had a silver metallic sticker on the rear panel says “United Recording Electronics Industries” in blue, with a blue UREI logo, along with Model and Serial No., starting around number 1750 | Made in U.S.A." with unit Type and Serial No. Company Nameplate: A metallic sticker on the rear panel says "Teletronix | United Recording | Electronics Industries | North Hollywood, Calif.Faceplate: Brushed aluminum with red "Teletronix" logo (brushed aluminum with black "UREI" logo starting around number 1750).Note: Teletronix patent acquired in 1967 along with the broadcast division of Babcock Electronics by Studio Electronics Corporation (later renamed United Recording Electronics Industries - UREI).Variable Pre-emphasis Filter (R37): Installed on this and all later units o 230 volt operation: yes possible on this and all later units.Safety Switch on front hinged panel: None.Octal Jumper Socket: Located before input transformer on early units (compress/limit switch installed in place of octal on rear panel, starting with number 573, but some later units still do not have it).Rear Panel Graphics: Hand stenciled or ink stamped on early units (screen printed starting around number 630).Plate: On the rear panel a metal plate with engraved numbers. | Broadcast and Communication | Equipment | Costa Mesa, California - Made in U.S.A." Company Nameplate: A metal plate on the rear panel says "Teletronix | Division of Babcock Electronics Corp.of Babcock" logo (some early units are painted battleship gray, with the original red "Teletronix Engineering Co." logo - these were presumably leftover stock) Faceplate: Brushed aluminum with red "Teletronix Div.Note: Teletronix company and its patents were acquired by Babcock Electronics Corporation of Costa Mesa, California in 1965.
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