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2. 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.

3. Dynaco - Wikipedia

   en.wikipedia.org/wiki/Dynaco

   Dynaco was an American hi-fi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components. [1] Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, it's best known product was the ST-70 tube stereo amplifier.

4. 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.

5. Eico - Wikipedia

   en.wikipedia.org/wiki/Eico

   EICO is also known for "monoblock" amplifiers such as the HF-50 and HF-35, stereo integrated amplifiers such as the ST-40 and ST-70, as well as many other amplifiers and preamplifiers. In the late 1960s, EICO introduced a line of solid state electronics audio equipment referred to as Cortina , but by the mid-1970s the only audio products they ...

6. David Hafler - Wikipedia

   en.wikipedia.org/wiki/David_Hafler

   Added later was the rugged DH-500 stereo amplifier, which was rated at 255 watts per channel and saw great success in home, studio, and live environments. The amplifiers were notable for their early use of new, more-powerful MOSFETs to enable much lower distortion at higher power, in a very economical fashion.

7. Specimen Products - Wikipedia

   en.wikipedia.org/wiki/Specimen_Products

   Specimen Products is a Chicago-based manufacturer of custom guitars, tube amplifiers, and audio horn speakers led by luthier Ian Schneller. Specimen Products also offers courses in guitar and tube amplifier design, construction, and repair through their Chicago School of Guitar Making. The Specimen workshop offers repair services to the general ...