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  2. Valve RF amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_RF_amplifier

    A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...

  3. 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.

  4. Dumble Amplifiers - Wikipedia

    en.wikipedia.org/wiki/Dumble_Amplifiers

    Thus Dumble amplifiers are the most expensive boutique amplifiers on the used market [3] and prices have risen rapidly. In 2012, Vintage Guitar magazine said the Dumble Overdrive Special is the most valuable in the product line, with used amplifiers fetching between $70,000 and $150,000. [4] Other models have sold for more. [5]

  5. 12AX7 - Wikipedia

    en.wikipedia.org/wiki/12AX7

    Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. As a popular choice for guitar tube ...

  6. Traveling-wave-tube amplifier - Wikipedia

    en.wikipedia.org/wiki/Traveling-wave_tube

    TWTAs are commonly used as amplifiers in satellite transponders, where the input signal is very weak and the output needs to be high power. [21] TWTAs used in satellite communications are considered as reliable choices and tend to live beyond their expected lifetime of 15-20 years. [22] A TWTA whose output drives an antenna is a type of ...

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