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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 ...
Inseparable assemblies—i.e., "items which are ordinarily replaced as a single item of supply" [2] —are typically treated as components in this referencing scheme. Examples: 1A12A2R3 - Unit 1, Assembly 12, Sub-assembly 2, Resistor 3; 1A12A2U3 - Unit 1, Assembly 12, Sub-assembly 2, Inseparable Assembly 3
Earth Sound Research specialized in electric bass and guitar amplifiers in the 1970s. [3] They also manufactured PA mixers, power amps, [ 4 ] and stand alone solid state reverb units. The company also manufactured ESR brand distortion pedals such as the Graphic Fuzz which was based somewhat on a Craig Anderton fuzz and volume pedal.
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.
Approximately 600 of these amps were built during that time. [2] The single-channel version of the amplifier employed modest gain in the preamp stages, Baxandall type bass and treble controls, a split load phase inverter, and four 6V6GT output tubes. [3] [4] The amplifiers produce 60 watts RMS at full power, and include a half power (30/60) switch.
The 0.1% distortion figure of the Williamson amplifier became the criterion for high fidelity performance [2] [3] that remains valid in the 21st century. [ 4 ] The Williamson amplifier was sensitive to selection and matching of passive components and valves, and prone to unwanted oscillations at infrasonic and ultrasonic frequencies.
This tube is essentially two 6C4/EC90s in the same envelope. However, this latter type is officially described in manufacturer's data as "a special quality R.F. power amplifier or oscillator for frequencies up to 150 MHz". [2] The 12AU7, on the other hand, is described as an "A.F. double triode". [3]
It has two radio frequency amplifier stages, one grid-leak detector/amplifier and three class ‘A’ audio amplifier stages. There are 3 tuned circuits T1-C1, T2-C2, and T3-C3 . The second and third tuning capacitors, C2 and C3 , are ganged together (indicated by line linking them) and controlled by a single knob, to simplify tuning.