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2. YaqinAudio - Wikipedia

   en.wikipedia.org/wiki/YaqinAudio

   MS-845 - 25 WPC monoblock amplifiers with separate pre amplifier, Single Ended 2*845 tubes; MS-650 - 15 WPC Single Ended 2*845 tubes; T-6P3P - 4 WPC triode mode, 12 WPC in ultralinear mode, Headphone output, Single Ended amplifier 2*6P3P tubes; Hybrid-amplifiers VK-2100 - 85 WPC 4*12AX7 tubes; CD player with tube output SD-28A - discontinued

3. 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 ...

4. 12AU7 - Wikipedia

   en.wikipedia.org/wiki/12AU7

   The tube is popular in hi-fi vacuum tube audio as a low-noise line amplifier, driver (especially for tone stacks), and phase-inverter in vacuum tube push–pull amplifier circuits. It was widely used, in special-quality versions such as ECC82 and 5814A, in pre-semiconductor digital computer circuitry.

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. Valve amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_amplifier

   A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.

7. 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.