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2. Headphone amplifier - Wikipedia

   en.wikipedia.org/wiki/Headphone_amplifier

   A headphone amplifier is a low-powered audio amplifier designed particularly to drive headphones worn on or in the ears, instead of loudspeakers in speaker enclosures. Most commonly, headphone amplifiers are found embedded in electronic devices that have a headphone jack, such as integrated amplifiers , portable music players (e.g., iPods), and ...

3. Output transformerless - Wikipedia

   en.wikipedia.org/wiki/Output_transformerless

   Output transformerless (OTL) is a type of vacuum tube audio power amplifier, which omits an output transformer for the purpose of greater linearity and fidelity. Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifier's output stage to the loudspeaker.

4. Tube sound - Wikipedia

   en.wikipedia.org/wiki/Tube_sound

   Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. [1] At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable ...

5. Single-ended triode - Wikipedia

   en.wikipedia.org/wiki/Single-ended_triode

   A SET tube audio amplifier. A single-ended triode (SET) is a vacuum tube electronic amplifier that uses a single triode to produce an output, in contrast to a push-pull amplifier which uses a pair of devices with antiphase inputs to generate an output with the wanted signals added and the distortion components subtracted.

6. CMoy - Wikipedia

   en.wikipedia.org/wiki/CMoy

   A CMoy is a pocket headphone amplifier originally designed by Pow Chu Moy. [1] [2] The headphone amplifier is designed around single or dual-channel operational amplifiers (op-amps) such as Burr-Brown's OPA2134 or OPA2132PA, however, a wide variety of op-amps have been successfully implemented. As the op-amp directly drives headphones, some ...

7. Circlotron - Wikipedia

   en.wikipedia.org/wiki/Circlotron

   An amplifier with one 6AS7 dual triode per channel (R p = 270 ohms, [4] μ = 2) will have a Z of about 67 ohms—sufficient to drive most headphones. Driving loudspeakers requires paralleling output tubes, and in practice, V1 and V2 are not single triodes, but massive banks of paralleled triodes.