Search results
Results from the WOW.Com Content Network
A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.
There are two types of transistors, with slight differences in how they are used: A bipolar junction transistor (BJT) has terminals labeled base, collector and emitter. A small current at the base terminal, flowing between the base and the emitter, can control or switch a much larger current between the collector and emitter.
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 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 tube preamplified signal in a hybrid amplifier head is then sent to a solid state power amplifier. Compared with tube power amps, solid state power amplifiers are more reliable, require less maintenance, less fragile and lighter in weight. A hybrid tube preamp/solid state power amp thus provides a bass player with the benefits of both ...
No amplifier can provide perfect linearity however, because the amplifying devices—transistors or vacuum tubes—follow nonlinear transfer function and rely on circuitry techniques to reduce those effects. There are a number of amplifier classes providing various trade-offs between implementation cost, efficiency, and signal accuracy.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
According to the Vox website, this version of the AC30 includes both "solid-state" and "tube" technology. Originally designed for the Valvetronix modelling amplifiers, the Valve Reactor circuit places a 12AX7 dual triode vacuum tube (or "valve") into the power stage, which is a tube configured to act as a small power amplifier.