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According to the manufacturer, the NAD 3020 is a high voltage design that uses the same large powerful output transistors (2N3055 and MJ2955) that "other manufacturers employ in their '60-watt' amplifiers", enabling the amplifier to deliver power headroom for musical transients. [7]
The Regency TR-1 circuitry was refined from the TI design, reducing the number of parts, including two more expensive transistors. Although this severely reduced audio output volume, it let I.D.E.A. keep the price down to $49.95, ($510 in 2021), which was a significant amount of money for such a small, untried object. [4]
The 2N3055 is a silicon NPN power transistor intended for general purpose applications. It was introduced in the early 1960s by RCA using a hometaxial power transistor process, transitioned to an epitaxial base in the mid-1970s. [1] Its numbering follows the JEDEC standard. [2] It is a transistor type of enduring popularity. [3] [4] [5]
The Compactron was a trade name applied to multi-electrode structure tubes specifically constructed on a 12-pin Duodecar base. This vacuum tube family was introduced in 1961 by General Electric in Owensboro, Kentucky [1] to compete with transistorized electronics during the solid state transition. [2]
The characteristics of valves as gain devices have direct implications for their use as audio amplifiers, notably that power amplifiers need output transformers (OPTs) to translate a high-output-impedance high-voltage low-current signal into a lower-voltage high-current signal needed to drive modern low-impedance loudspeakers (cf. transistors ...
The amplifier can supply humongous current, massive output power, tremendous voltage, runs cool, and is efficient. 6) Only 12 output transistors are needed per channel for a peak-to-peak current of 240 amps. 7) Bias current and idling current issues become irrelevant and nonproblematic. 8) The Tracking Downconverter multiplies current in the ...
where is the transconductance, and is the output resistance of transistor. As a first-order approximation, r o {\displaystyle r_{o}} is directly proportional to the channel length of transistors. In a single-stage amplifier, one can increase channel length to get higher output resistance and gain as well, but this also increases the parasitic ...
The company was known for the most powerful audio amplifiers of the era led by the Phase Linear D-500 introduced in 1978. It was a stereo power amplifier delivering 505 watts of clean (typically < 0.1% total harmonic distortion over 20 Hz–20 kHz) RMS power per channel. It had a retail price of $1395. Buyout
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