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ACR score is a scale to measure change in rheumatoid arthritis symptoms. [1] It is named after the American College of Rheumatology. The ACR score is more often used in clinical trials than in doctor patient-relationships, as it allows a common standard between researchers. Different degrees of improvement are referred to as ACR20, ACR50, ACR70 ...
The Blues Junior is a tube guitar amplifier introduced in 1995 by the Fender Musical Instrument Corporation. It is aimed at achieving the warm, tube-driven tone common in many styles of American blues and blues rock dating back to the 1950s, while remaining both portable and affordable. A popular amp, Fender have released numerous versions ...
A maximum theoretical efficiency of 25% is obtainable using usual configurations, but 50% is the maximum for a transformer or inductively coupled configuration. [6] [7] In a power amplifier, this not only wastes power and limits operation with batteries, but increases operating costs and requires higher-rated output devices. Inefficiency comes ...
65amps is a musical equipment manufacturer, founded in 2002 (incorporated in 2004) by Dan Boul and Peter Stroud. Based in North Hollywood, CA, they manufacture hand-wired tube-powered guitar and bass amplifiers and cabinets.
The Fender Deluxe amp of the 1950s was a medium-powered unit designed to let guitarists "hold their own" in a small group. As blues, western swing, Western, and rockabilly bands began getting louder, the overdriven tone of a cranked-up Deluxe found its way onto many live and recorded performances. The earliest version of the Deluxe was the 5A3 ...
Audio power. Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts. The electrical power delivered to the loudspeaker, together with its efficiency, determines the sound power generated (with the rest of the electrical power being converted to heat). Amplifiers are limited in the electrical ...
The amplifier's circuit was changed in 1955 (until then it was identical to the Fender Pro, except for the speaker configuration) when the 6L6 tubes were exchanged for 6V6 tubes; the 1958 5F4 model was again equipped with 6L6 tubes, so its circuitry was again almost identical to that of the Pro (5E5-A model) and the Bandmaster (5E7 model).
The human ear perceives a 5-watt amplifier as half as loud as a 50-watt amplifier (a tenfold increase in power), and a half-watt amplifier is a quarter as loud as a 50-watt amp. Doubling the output power of an amplifier results in a just noticeable increase in volume, so a 100-watt amplifier is only just noticeably louder than a 50-watt amplifier.
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