Avalon AD2022 Microphone Preamplifier (Black)

Avalon AD2022 Microphone Preamplifier (Black)The dual mono Avalon 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.

The dual mono Avalon 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.

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.

Features

Symmetrical Pure Class A design, two channelsMicrophone and hi-Z instrument inputsGain switched 4dB steps plus +/- 3dB fine output trimSelectable microphone input impedance matchingLow noise -126dB EINUltra high quality, low-ratio, balanced input transformerBalanced, high-current Class A output to +36dBLarge illuminated analog VU meters and twin peak LED'sRegulated phantom power supply +48vInput polarity phase reverseHigh headroom +36dB input before overloadInput -20dB pad for high level signalsSealed silver relays for all signal routingExternal AC 150w toroidal power chassisFully discrete Class A regulated audio power suppliesDeep, musical sound-stage, transparent amplification