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2. Specimen Products - Wikipedia

   en.wikipedia.org/wiki/Specimen_Products

   The Specimen Products line of tube-driven amplifiers began with the Petimor model, a 10-watt birchwood based amplifier designed to accommodate classical guitar. Also available is the Stereo Amp, which is essentially two Petimors in one case, angled at 25 degrees apart. After a variety of smaller-scale experiments, Specimen released the Horn Amp ...

3. Ampeg Portaflex - Wikipedia

   en.wikipedia.org/wiki/Ampeg_Portaflex

   The first amp in Ampeg’s Portaflex series was the B-15, a 2-channel tube amplifier with per-channel volume controls and shared Baxandall-type tone control, housed within a ’flip-top’ tuned-port cabinet design mounted to a dolly. Shortly after the B-15’s introduction in 1960, it became the most popular bass amp in the world.

4. Trainwreck Circuits - Wikipedia

   en.wikipedia.org/wiki/Trainwreck_Circuits

   Trainwreck Circuits is an American company that manufactures boutique guitar amplifiers. The company was founded by Ken Fischer (May 12, 1945 – December 23, 2006) in 1985. The company was founded by Ken Fischer (May 12, 1945 – December 23, 2006) in 1985.

5. 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.

6. Randall Amplifiers - Wikipedia

   en.wikipedia.org/wiki/Randall_Amplifiers

   In the early 2000s, the company worked with Bruce Egnater of Egnater Amplification to create the MTS (Modular Tube System) series of guitar amplifiers. These involve a single amp head consisting of the power amp and part of a preamp, and slots in the head (one for the RM20 head and combo, two for the RM50 head and combo and RM22 head, and 3 for the RM100 head and RM100C combo, and 12 for the ...

7. Guitar amplifier - Wikipedia

   en.wikipedia.org/wiki/Guitar_amplifier

   Mesa-Boogie Mark IV, a guitar combo amplifier. A guitar amplifier (or amp) is an electronic device or system that strengthens the electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which are typically housed in a wooden cabinet.