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Unlike their solid-state equivalents, tube rectifiers require time to warm up before they can supply B+/HT voltages. This delay can protect rectifier-supplied vacuum tubes from cathode damage due to application of B+/HT voltages before the tubes have reached their correct operating temperature by the tube's built-in heater. [32]
The 0Z4 was a gas-filled rectifier tube commonly used in vacuum tube car radios in the 1940s and 1950s. It was a conventional full-wave rectifier tube with two anodes and one cathode, but was unique in that it had no filament (thus the "0" in its type number).
The solid-state device which operates most like the pentode tube is the junction field-effect transistor (JFET), although vacuum tubes typically operate at over a hundred volts, unlike most semiconductors in most applications.
The term solid-state became popular at the beginning of the semiconductor era in the 1960s to distinguish this new technology. A semiconductor device works by controlling an electric current consisting of electrons or holes moving within a solid crystalline piece of semiconducting material such as silicon, while the thermionic vacuum tubes it replaced worked by controlling a current of ...
The main configurations for an early tube AM/FM set using EABC80 in the 1950s and '60s were: EC92+EF80 (or 85 or 89)+ECH81+EF80 (or 85 or 89)+EABC80+EL84 (or 95) -or- ECC85+EF80 (or 85 or 89)+ECH81+EABC80+EL84 (or 95)+ rectifier (tube or solid state) and indicator, depending on the radio class and manufacturer. For AC/DC radios, UCC85+UCH81 ...
R – Rectifier or RF tube; U – Gas-filled power rectifier; Z – Modulator tube; Next letter(s): Type, subset of the Mullard–Philips scheme. Next number: Anode dissipation in W (if radiation cooled) or kW (otherwise) The next letter specifies the cooling method: <none> – Radiation; V – Vapor; X – Forced air; Y – Water; Examples:
Mercury rectifier on display in the Beromünster AM transmitter in Switzerland, before being decommissioned.Three-phase full-wave rectifier with six anodes. A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier [1] [2] is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC).
Reference 2D21 tube is 2⅛ inches tall (54 mm). A thyratron is a type of gas-filled tube used as a high-power electrical switch and controlled rectifier. Thyratrons can handle much greater currents than similar hard-vacuum tubes. Electron multiplication occurs when the gas becomes ionized, producing a phenomenon known as a Townsend discharge.