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2. Epiphone Valve Junior - Wikipedia

   en.wikipedia.org/wiki/Epiphone_valve_junior

   The first Epiphone Valve Juniors (version 1) were only combo amplifiers and received only a fair reception, due to such problems as buzzing and hum caused by the AC filament voltage. Epiphone then released a head version, correcting these issues and changed the AC filament voltage to DC voltage. Version 2 combos also featured these modifications.

3. Epiphone - Wikipedia

   en.wikipedia.org/wiki/Epiphone

   They used a tube design, and some had reverb and tremolo. Gibson decided to launch a new line of Epiphone tube amplifiers in 2005 with models including the So Cal, Blues Custom, Epiphone Valve Junior and the solid state Triggerman range. The Valve Hot Rod and Valve Senior followed in 2009. The Valve Hot Rod is a 5 watt amp like the Valve Junior ...

4. List of valve amplifier designs - Wikipedia

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

   LEAK TL/12 Point One Amplifier. The first commercially produced amplifier with distortion of 0.1% was the LEAK Type 15 "Point One" of 1945, using KT66 vacuum tubes (valves) connected as triodes, with 26 dB feedback over 4 stages including the output transformer. In 1948 LEAK produced the TL/12 which was also rated at 0.1% but featured improved ...

5. Specimen Products - Wikipedia

   en.wikipedia.org/wiki/Specimen_Products

   Specimen's line of tube amplifiers use 1940s-era tube circuitry, yet is compatible with an iPod or computer. The product line includes a single-ended stereo amp, 300B stereo tube amp, single-ended monoblock, a single-ended 2A3 tube amp, a pentode-driven 2A3 amp, and the Octoblock (an eight channel single ended power amp created for the ...

6. 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 ...

7. 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.