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Generally speaking, solid-state power amplifiers contain four main components: input, output, amplification stage and power supply. [8] MOSFET transistors and other modern solid-state devices have replaced vacuum tubes in most electronic devices, but tubes are still used in some high-power transmitters (see Valve RF amplifier). Although ...
The proliferation of integrated circuits in modern amateur radio equipment has made amateurs nostalgic for vacuum tube-based designs. Radios that contain solid state parts do not require frequent tinkering, whereas vacuum tube radio equipment is less predictable, lending routine radio contacts more excitement, and giving vintage amateur radio ...
Solid state linear amplifiers are more common in the 1000-watt range and can be driven by as little as 5 watts. [3] Modern power devices using LDMOS technology allow for more efficient, cost-effective linear RF power amplifiers for the amateur radio community. [4]
Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. [1] At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable ...
In 1978 Drake abandoned vacuum tubes (except for their use in power amplifiers) in favor of solid state designs and digital frequency synthesis. The new “7-Line” included the TR-7 transceiver, the R-7 receiver, and various accessories including two linear amplifiers, the L-7 and L-75.
Indirect FM solid state circuit. Indirect FM employs a varicap diode to impose a phase shift (which is voltage-controlled) in a tuned circuit that is fed with a plain carrier. This is termed phase modulation. In some indirect FM solid state circuits, an RF drive is applied to the base of a transistor.
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