Valve Audio Amplifier - Technical
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Valves are very high input impedance (near infinite in most circuits) and high output impedance devices. They are also high voltage / low current devices. While valves themselves are described under vacuum tube, these characteristics of valve as gain devices have direct implications for their use as audio amplifiers, notably that power amps need output transformers (OPTs) to translate a high output impedance high voltage low current signal into a lower voltage high…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Valves are very high input impedance (near infinite in most circuits) and high output impedance devices. They are also high voltage / low current devices. While valves themselves are described under vacuum tube, these characteristics of valve as gain devices have direct implications for their use as audio amplifiers, notably that power amps need output transformers (OPTs) to translate a high output impedance high voltage low current signal into a lower voltage high current signal needed to drive modern low impedance loudspeakers (cf. transistors and FETs (which are relatively low voltage devices but able to carry large currents directly).