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A pentode is an electronic device having five electrodes. The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard D.H. Tellegen in 1926. [ 1 ]
One early pentode transistor was developed in the early 1950s as an improvement over the point-contact transistor. A point-contact transistor having three emitters. It became obsolete in the middle 1950s. Pentode field-effect transistors having 3 gates, similar to vacuum tube pentodes have also been described [1]
The 6AK5 vacuum tube is a miniature 7-pin sharp-cutoff pentode used as RF or IF amplifier especially in high-frequency wide-band applications at frequencies up to 400 MHz.. It was developed by Bell Labs / Western Electric and used extensively as an I.F. amplifier in World War II radar systems.
EF50. In the field of electronics, the EF50 is an early all-glass wideband remote cutoff pentode designed in 1938 by Philips.It was a landmark in the development of vacuum tube technology, departing from construction techniques that were largely unchanged from light bulb designs. [1]
The 6AQ5 [1] (Mullard–Philips tube designation EL90) is a miniature 7-pin (B7G) audio power output pentode vacuum tube with ratings virtually identical to the 6V6 at 250 V. [2] It was commonly used as an output audio amplifier in tube TVs and radios.
The GU-50 (Russian: ГУ-50) is a power pentode vacuum tube intended for 50 watt operation as a linear RF amplifier on frequencies up to 120 MHz. It is, in fact, a Soviet-produced copy of the Telefunken LS-50 power pentode, [ 1 ] possibly reverse-engineered from German ( Wehrmacht ) military radios captured during World War II , or based on ...
Bernard D.H. Tellegen [1] (24 June 1900 – 30 August 1990) was a Dutch electrical engineer and inventor of the pentode and the gyrator.He is also known for a theorem in circuit theory, Tellegen's theorem.
The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...