While semiconductor amplifiers have largely displaced valve amplifiers for low power applications, valve amplifiers can be much more cost effective in high power applications such as radar, countermeasures equipment, and communications equipment.
22.
Orange Matamp 100W valve amplifier, usually used with two 4 x 12 Orange speaker cabinets ( used by the whole band for a period ) and separate Orange ( valve ) spring reverb unit.
23.
Modern amplifiers invariably run from the mains; as there is little need to minimise costs in expensive valve amplifiers, the heater supply is often rectified and even regulated to reduce hum to an absolute minimum.
24.
The basic gain stage for a valve amplifier is the auto-biased common cathode stage, in which an anode resistor, the valve, and a cathode resistor form a potential divider across the supply rails.
25.
Valve amplifiers are used for applications such as guitar amplifiers, satellite transponders such as DirecTV and GPS, audiophile stereo amplifiers, military applications ( such as radar ) and very high power radio and UHF television transmitters.
26.
In the audiophile world, such popularity is justified on the basis of sound quality, the earlier valve amplifier designs were free of such artifacts as crossover distortion that beset the early bipolar transistor designs of the 1960s.
27.
In this design, the audio signal is applied directly to the stators from a built-in high-voltage valve amplifier ( as valves are also high impedance devices ), without use of a step-up transformer.
28.
A "'valve audio amplifier "'( UK ) or "'vacuum tube audio amplifier "'( United States ) is a valve amplifier used for sound reinforcement, sound recording and reproduction.
29.
This circuit was designed to emulate valve amplifier distortion [ hence V-S for valve sound ] but with controllable master volume, the V-S circuit was encased in a block of resin to prevent copying by competitors.
30.
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 transmitters, transmitter output stages switching to transistors somewhat later.
