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Yaqin (pronounced "Ja-chin") [1] is one of the more prolific Chinese manufacturers of valve (tube) based audio equipment. They claim to have "engage [ sic ] in power amplifier research and production more than 10 years."
Historically, it has been far more popular with high fidelity stereo manufacturers than guitar amplifier builders, given its characteristics of high-power and low-distortion. Due to these characteristics, it is regularly used to replace 6550 tubes by end users seeking a guitar amplifier tone with less distortion. [ 6 ]
The 400 BH power amp module was used in a range of bass amps during the early 1980s, commencing with the MKIII Bass Head in 1979. The MKIV Bass Amp head unit, introduced in 1981, offers a range of functions. It is air cooled, features protection circuitry, and is capable of around 300/350 watts RMS safely into 2 ohms.
A Chinese version of the triple mica 6N2P-EV exists too, designated 6N2T. Currently a 12AX7 variant derived from the Chinese 6N2T is manufactured by the Shuguang tube factory exclusively for Tube Amp Doctor, under the designation ECC83 WA (7025 WA designation is used for the ones specially selected for high gain and low noise).
The Chinese version of this tube is called FU-50 and production still continues, probably by Shuguang, the major Chinese tube builder. The tube was originally designed for mobile operations, so its filament draws only 0.705 amps of current, while anode power dissipation allowed is up to 40 watts, quite big for such low filament power.
Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. [1] At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable ...