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2. Dynaco - Wikipedia

   en.wikipedia.org/wiki/Dynaco

   Dynaco. Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, 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] Its best known product was the ST-70 tube stereo amplifier. They also manufactured other tube and ...

3. David Hafler - Wikipedia

   en.wikipedia.org/wiki/David_Hafler

   Around this time Hafler and Keroes popularized the ultra-linear output-stage for audio amplifiers. However, the partnership did not last. In 1954 Hafler founded Dynaco with Ed Laurent. Hafler was instrumental in bringing affordable, high-quality audio kits to hobbyists, making his name a household word in the US audio community for many years.

4. Williamson amplifier - Wikipedia

   en.wikipedia.org/wiki/Williamson_amplifier

   The Williamson amplifier is a four-stage, push-pull, class A triode valve amplifier built around a high quality, wideband output transformer. [ 59] Its second (concertina-type phase splitter, V1B), third (driver, V2A and V2B) and fourth (output, V3 and V4) stages follow Cocking's Quality Amplifier circuit.

5. Valve audio amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_audio_amplifier

   A valve audio amplifier ( UK) or vacuum tube audio amplifier ( US) 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. While solid-state devices prevail in most audio ...

6. List of valve amplifier designs - Wikipedia

   en.wikipedia.org/wiki/List_of_valve_amplifier...

   The amplifier used the excellent Partridge output transformer and was well known for its great sound reproduction. Dynaco. Dynaco was a major US manufacturer of completed and kit amplifiers of high quality, notably of the Mark III and the Stereo 70, claimed to be the most popular tube amp ever made with over 300,000 produced. McIntosh MC275

7. Eico - Wikipedia

   en.wikipedia.org/wiki/Eico

   EICO was established in New York City in 1945 by radio repair business owner Harry Ashley to manufacture electronic test equipment in kit form. His first product, advertised in the July 1946 Radio News, was the model 113 VTVM/audible signal tracer. [1] A wide variety of test equipment remained the company's mainstay during the time it was in ...