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This is only a very brief overview and we suggest consulting additional resources if you are interested in additional information. Most good guitar amplifiers use tubes rather than solid-state components. The amplifier is a critical element in achieving the sound the musician desires. Tube amps are warmer, richer and have a more desirable tone than solid-state amps.
Although the envelope was classically glass, power tubes often use ceramic and metal.Other configurations are also possible including the Pentode, a tube with 5 active elements providing an additional amplification factor.There are a large number of tube varieties and uses.Transformers are used to convert between high and low voltages, to change impedance, and to provide electrical isolation between circuits.This is useful in converting the voltage from a wall outlet, typically 120 or 240 volts, into a higher voltage required by tubes in tube amps .
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The resulting negatively-charged cloud of electrons is called a space charge.