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  2. 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.

  3. Tube sound - Wikipedia

    en.wikipedia.org/wiki/Tube_sound

    The tube sound is often subjectively described as having a "warmth" and "richness", but the source of this is by no means agreed on. Possible explanations mention non-linear clipping, or the higher levels of second-order harmonic distortion in single-ended designs, resulting from the tube interacting with the inductance of the output transformer.

  4. Dynaco - Wikipedia

    en.wikipedia.org/wiki/Dynaco

    The driver circuit had a single 7199 pentode/triode tube per channel and used the driver tube to handle both voltage amplification and phase splitting. The output transformers are an ultralinear design, whereby part of the primary winding is fed back to the output tube's screen grid. This design reduced distortion and improved audio quality.

  5. Circlotron - Wikipedia

    en.wikipedia.org/wiki/Circlotron

    Circlotron valve amplifier is a type of power amplifier utilizing symmetrical cathode-coupled bridge layout of the output stage. Original circlotrons of 1950s used output transformers to couple relatively high output impedance of vacuum tubes to low-impedance loudspeakers.

  6. Valve audio amplifier technical specification - Wikipedia

    en.wikipedia.org/wiki/Valve_audio_amplifier...

    The characteristics of valves as gain devices have direct implications for their use as audio amplifiers, notably that power amplifiers 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 ...

  7. Impedance matching - Wikipedia

    en.wikipedia.org/wiki/Impedance_matching

    Some tube amplifiers have output transformer taps to adapt the amplifier output to typical loudspeaker impedances. The output transformer in vacuum-tube-based amplifiers has two basic functions: Separation of the AC component (which contains the audio signals) from the DC component (supplied by the power supply) in the anode circuit of a vacuum ...

  8. 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.

  9. Ultra-linear - Wikipedia

    en.wikipedia.org/wiki/Ultra-Linear

    Ultra-linear electronic circuits are those used to couple a tetrode or pentode vacuum-tube (also called "electron-valve") to a load (e.g. to a loudspeaker). 'Ultra-linear' is a special case of 'distributed loading'; a circuit technique patented by Alan Blumlein in 1937 (Patent No. 496,883), although the name 'distributed loading' is probably due to Mullard. [1]

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