Avalon Design AD-2022

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The AD2022 is Avalon's fourth generation of fully discrete, symmetrical Pure Class A microphone preamplifiers. The dual mono AD2022 includes the original sonic capabilities and transparency of the M2, M22 and M5 preamplifiers plus several additional features, including selectable microphone source loading for optimized cable/mic matching, improved high-voltage Class A regulated power supplies, two high Z instrument inputs, variable-passive high pass filter, teflon/silver wiring and doubled plated circuit boards for superior low level signal transfer.

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


MICROPHONE INPUT
The AD2022 incorporates the most advanced high-performance microphone transformer available. Split low-ratio primary windings are carefully combined within a custom mu-metal core for extended smooth frequency response and very low distortion. Sealer silver relays are used for minimal signal invasion. The input signal selector, high pass filter, polarity-phase reverse, +48v power and the 20dB input attenuator all utilize local sealed 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 cascaded-cascode 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 offers peak indication at 0dB and +20dB.

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