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2. 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. Valve amplifiers can be used for applications such as ...

3. 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 amplifiers ...

4. Fender Harvard - Wikipedia

   en.wikipedia.org/wiki/Fender_Harvard

   Fender Harvard. 1959 Fender Harvard 5F10. The Fender Harvard is a vacuum tube (valve) guitar amplifier made by Fender from 1955 to 1963. The Harvard appeared only in a tweed covered "narrow-panel" cabinet, but in two very different circuit designs, namely 5F10 (1955–61) and 6G10 (1962–63). [1]

5. Fender amplifier - Wikipedia

   en.wikipedia.org/wiki/Fender_amplifier

   Fender amp "tailless" logo. Fender amplifiers are electric instrument amplifiers produced by the Fender Musical Instruments Corporation. The first guitar amplifiers attributed to Leo Fender were manufactured by the K&F Manufacturing Corporation (K&F) between 1945 and 1946. Later, Fender began building its own line of electric guitars.

6. 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 ...

7. 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