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A linear amplifier is an electronic circuit whose output is proportional to its input, but capable of delivering more power into a load. The term usually refers to a type of radio-frequency (RF) power amplifier , some of which have output power measured in kilowatts , and are used in amateur radio .
A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...
A radio-frequency power amplifier (RF power amplifier) is a type of electronic amplifier that converts a low-power radio-frequency (RF) signal into a higher-power signal. [1] Typically, RF power amplifiers are used in the final stage of a radio transmitter , their output driving the antenna .
The 807 is fully rated to 60 MHz, derated to 55% at 125 MHz in Class C, Plate-modulated operation, thus they were popular with amateur radio operators (radio hams). In this application a single 807 could be run in class-C as an oscillator or amplifier which could be keyed on and off to transmit Morse Code in CW mode.
Hayden is a British company which designs hand-wired electric guitar amplifiers. It is a sister company to Ashdown Engineering, which makes high-quality, hand-wired, vacuum-tube (or valve in Britain) amplifiers in England. At the end of 2007 it was announced that Dave Green, Matamp's chief engineer, would be joining Hayden full-time as 'Valve ...
K.W. Electronics was a British manufacturer of amateur radio equipment founded in the mid-1950s by the late Rowley Shears G8KW. It was based in Dartford, Kent, and manufactured a wide range of high frequency band receivers, transmitters and accessory equipment.
Oscillator and a mixer. Used in ham radio applications. [6] Operational amplifier: DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. [7] Telefunken U401B: Yes High quality High Com analogue compander for audio in the 1970s. Telefunken U401BG: Telefunken U401B: Yes
Improved models of the two transceivers were periodically introduced well into the 1970s along with accessories, including a remote VFO (for separate control of receiver and transmitter frequency) and the Mark-I and Mark-II linear amplifiers. Magazine ad circa 1970s featuring Swan 600T/600R
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