[Mr Carlson] serves up another vintage offering, this time in the form of a tube op amp. The K2-W model he acquired enjoyed popularity when it was released as one of the first modular general purp ...

implementing as it does a complete simple op-amp with five transistors. Looking at the circuit diagram it follows the classic op-amp with a long-tailed pair of NPN transistors driving a PNP gain ...

Generally, most amplifiers use either vacuum tubes (tube amps) or transistors (solid state amps) to translate the current ...

This is a very important transistor circuit, as it is the basis of the operational amplifier (or op amp), one of the most useful devices for analog signal processing. Probably the most surprising ...

Opinions expressed by Forbes Contributors are their own. Technology journalist specializing in audio, computing and Apple Macs. Probably one of the most celebrated amplifiers ever made—the 33/ ...