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2. Tung-Sol - Wikipedia

   en.wikipedia.org/wiki/Tung-Sol

   The 6550 is a beam power tube designed by Tung-Sol for application as an audio frequency power amplifier and introduced in 1954. [ 136 ] [ 137 ] Tung-Sol literature refers to the 6550 variously as a beam power amplifier, power pentode and beam pentode, with the latter two names viewing the beam confining structure as a fifth electrode.

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. KT88 - Wikipedia

   en.wikipedia.org/wiki/KT88

   Historically, it has been far more popular with high fidelity stereo manufacturers than guitar amplifier builders, given its characteristics of high-power and low-distortion. Due to these characteristics, it is regularly used to replace 6550 tubes by end users seeking a guitar amplifier tone with less distortion. [ 6 ]

5. Amateur radio homebrew - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_homebrew

   Homebrew is an amateur radio slang term for home-built, noncommercial radio equipment. [1] Design and construction of equipment from first principles is valued by amateur radio hobbyists, known as "hams", for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products.

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. Some Sacramento homes might be built from kits. But did they ...

   www.aol.com/sacramento-homes-might-built-kits...

   While an estimated 75,000 to 100,000 homes were built through the Sears Modern Homes collection between 1908 and 1942, in styles like Craftsman, Colonial and bungalow, the high cost of shipping ...