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2. David Hafler - Wikipedia

   en.wikipedia.org/wiki/David_Hafler

   David Hafler (February 7, 1919 – May 25, 2003) was an American audio engineer. He was best known for his work on an improved version of the Williamson amplifier using the ultra-linear circuit of Alan Blumlein .

3. 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 ...

4. Heathkit - Wikipedia

   en.wikipedia.org/wiki/Heathkit

   Oscilloscope OL-1 from 1954, the company's first with a relatively small 3-inch CRT which allowed for a highly competitive price of US$ 29.50 (equivalent to $335 in 2023) for the DIY kit. [1] Heathkit is the brand name of kits and other electronic products produced and marketed by the Heath Company.

5. 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 ...

6. 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 ...

7. Class-D amplifier - Wikipedia

   en.wikipedia.org/wiki/Class-D_amplifier

   The first Class-D amplifier was invented by British scientist Alec Reeves in the 1950s and was first called by that name in 1955. The first commercial product was a kit module called the X-10 released by Sinclair Radionics in 1964. However, it had an output power of only 2.5 watts. The Sinclair X-20 in 1966 produced 20 watts but suffered from ...