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2. Milbert Amplifiers - Wikipedia

   en.wikipedia.org/wiki/Milbert_Amplifiers

   It introduces its mobile vacuum-tube audio amplifier in 1986, which has been followed by several models collectively in continuous production for nearly 30 years. The company also produces vacuum-tube guitar and musical amplifiers [2] using unique impedance conversion [3] which is claimed to prolong tube operating lifetimes. [4]

3. 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.

4. Lafayette Radio Electronics - Wikipedia

   en.wikipedia.org/wiki/Lafayette_Radio_Electronics

   The electronics kits were produced in the Jamaica facility. [1] Lafayette advertised heavily in major U.S. consumer electronics magazines of the 1960s and 1970s, particularly Audio, High Fidelity, Popular Electronics, Popular Mechanics, and Stereo Review. The company offered a free 400-page catalog filled with descriptions of vast quantities of ...

5. Manley Laboratories - Wikipedia

   en.wikipedia.org/wiki/Manley_Laboratories

   The first Manley-branded products were introduced in 1989, with Manley Laboratories becoming an independent company in 1993. Manley's products include microphones, signal processors, dynamic range processors, equalizers, converters, specialized mastering products, tube audio amplifiers, integrated amplifiers, and preamplifiers.

6. Valve audio amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_audio_amplifier

   A valve audio amplifier or vacuum tube audio amplifier is a valve amplifier used for sound reinforcement, sound recording and reproduction.. Until the invention of solid state devices such as the transistor, all electronic amplification was produced by valve (tube) amplifiers.

7. 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.