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Manual abstract: user guide AVALON DESIGN AD2022DATASHEET
Detailed instructions for use are in the User's Guide.
[. . . ] AVALON DESIGN PURE CLASS A AD2022 DUAL MONO MICROPHONE & INSTRUMENT PREAMPLIFIER
AVA L O N
P URE C LASS A
DESIGN
M USIC R ECORDING S YSTEMS
The AD2022 is Avalon's fourth generation of fully discrete, symmetrical Pure Class A microphone preamplifiers. [. . . ] The input signal selector, high pass filter, polarity-phase reverse, +48v power and the 20dB input attenuator all utilize local sealed silver relay operation. A variable passive high pass filter provides a minimum phase shift design while eliminating low frequency rumble, wind noise and mechanical vibration at sub sonic frequencies. SYMMETRICAL PURE CLASS A DESIGN Two 100% discrete, high-voltage, symmetrical Pure Class A signal amplifiers are utilized per channel. The first operates in a cascadedcascode FET configuration while the second stage amplifier is fully bipolar. The twin amplifiers share the total available gain requirement. This shared architecture increases the high level headroom capability, improves transient response and doubles the internal bandwidth of the ultra high performance Pure Class A signal amplifiers. OUTPUT and METERING High-current DC coupled, Class A discrete amplifiers are utilized for the output drive interface with +36dB capability into all known loads. Two large, high-quality analog VU meters indicate accurate signal readings while bi-color LED's offer peak indication at 0dB and +20dB.
AD2022
DUAL MONO, PURE CLASS A
PREAMPLIFIER
AD2022 FEATURES
* Symmetrical Pure Class A design, two channels * Microphone and Hi-Z instrument inputs * Gain switched 4dB steps plus +/- 3dB fine output trim * Selectable microphone input impedance matching * Low noise -126dB EIN * Ultra high quality, low-ratio, balanced input transformer * Balanced, high-current Class A output to +36dB * Large illuminated analog VU meters and twin peak LED's * Regulated phantom power supply +48v * Input polarity phase reverse * High headroom +36dB input before overload * Input -20dB pad for high level signals * Sealed silver relays for all signal routing * External AC 150w toroidal power chassis * Fully discrete Class A regulated audio power supplies * Deep, musical sound-stage, transparent amplification
c 2000 by AVALON INDUSTRIES, INC. [. . . ] Tel: 949-492-2000 Fax: 949-492-4284 Email: avalon@avalondesign. com www. avalondesign. com [. . . ]
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