A beam tetrode, sometimes called a beam power tube, is a type of vacuum tube or thermionic valve that has two grids and forms the electron stream from the cathode into multiple partially collimated beams to produce a low potential space charge region between the anode and screen grid to return anode secondary emission electrons to the anode ...

Modern designs of beam tetrode use an electrode geometry which enables the device to achieve its full potential, resulting in higher efficiency, much higher output for a given size and operation from audio to UHF all without the use of beam plates.

The beam tetrode was also developed as a high power radio transmitting tube. Tetrodes were widely used in many consumer electronic devices such as radios, televisions, and audio systems until transistors replaced valves in the 1960s and 70s.

Dec 8, 2014 · The Beam Power Tetrode has 5 elements, but the beam confining electrodes are not a grid. In particular RCA insisted in the name tetrode to distinguish it from the pentode patented by Philips. The beam power tetrode acts almost like a …

In the beam power tube, the basic four-element structure of the tetrode was maintained, but the grid and screen wires were carefully arranged along with a pair of auxiliary plates to create an interesting effect: focused beams or “sheets” of electrons traveling from cathode to plate.

As in the conventional pentode, the object of beam tetrode design is to prevent the passage of secondary electrons from the anode to the screen when the anode vol tage is below the screen voltage, a-nd from the screen to the anode when the anode voltage IS …

The beam tetrode was invented by MOV during the early 1930s as a means to circumvent the Philips pentode patent and to improve on the rather mediocre power pentodes then available. The electron stream beam forming process involved turn-by-turn alignment of grid and screen grid wires and the maintenance of this alignment during warm-up and ...

Radial Beam Tetrode The Alpha Tubes VTU-4CX3500A is a compact ceramic and metal radial beam power tetrode intended for use in VHF power amplifier applications. It features a type of internal mechanical structure which results in high rf operating efficiency. Low rf losses in this structure permit operation at full ratings to 220 MHz.

The 8122 is a very small, low-cost, forced-air-cooled beam power tetrode designed for use as an RF power amplifier, oscillator, regulator, distributed amplifier, or linear amplifier in mobile or fixed equipment.

The beam tetrode was developed as manufacturers were looking for a way to make audio output valves that would not infringe the Mullard (Philips) patent for the pentode. In the UK two EMI engineers developed and patented in 1933 the Beam Tetrode.