avalon-design ad2022 Data Sheet
2000 by AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A.
Tel: 949-492-2000 Fax: 949-492-4284 Email: avalon@avalondesign.com
www.avalondesign.com
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* 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
The AD2022 is Avalon's fourth generation of fully discrete, symmetrical
Pure Class A microphone preamplifiers. The dual mono AD2022
includes all 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
HI-Z instrument inputs, variable-passive high pass filter, teflon/silver
wiring and doubled plated circuit boards for superior low level signal
transfer.
Pure Class A microphone preamplifiers. The dual mono AD2022
includes all 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
HI-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 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.
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 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 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.
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 offer peak indication at 0dB and +20dB.
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
D U A L M O N O , P U R E C L A S S A
P R E A M P L I F I E R
A D 2 0 2 2 F E A T U R E S
AVALON DESIGN PURE CLASS A AD2022 DUAL MONO MICROPHONE & INSTRUMENT PREAMPLIFIER
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