Avalon AD2022 Specifications

AD2022

DUAL MONO, PURE CLASS A

PREAMPLIFIER

Pure Class A music recording systems since 1985.

2002 by AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A.

Tel: [phone] Fax: [phone]

www.avalondesign.com

[e-mail]

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Gain switched 4dB steps plus +/- 3dB fine output trim

Symmetrical Pure Class A design, two channels

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AD2022 FEATURES

The AD2022 is Avalon’s fourth generation of fully
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 high­performance microphone transformer available. Split low-ratio
primary windings are carefully combined within a custom mu­metal 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, polarity­phase 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.

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.

The M5 will make your

recordings musical masterpieces!

AVALON

DESIGN

Microphone and Hi-Z instrument inputs

Selectable microphone input impedance matching
Low noise -126dB EIN

Very low noise -126dB

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

External 150W toroidal power supply

Deep, musical sound-stage, transparent amplification

AVALON DESIGN PURE CLASS A AD2022 MONO MICROPHONE PREAMPLIFIER

2002 by AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A.

Tel: [phone] Fax: [phone]

www.avalondesign.com

[e-mail]

c

AD2022 PREAMPLIFIER SPECIFICATIONS

Avalon reserves the right to incorporate changes in design and in the specifications of this product without prior notice.

Pure Class A music recording systems since 1985.

AVALON

DESIGN

AVALON DESIGN PURE CLASS A AD2022 MONO MICROPHONE PREAMPLIFIER

Circuit topology

Input type and load
Maximum mic level

Maximum instrument level
Input attenuator

Phantom power
High pass filter
Polarity reverse

Gain range input
Gain output range
Maximum output level
Output type

Noise EIN unweighted
Noise 20kHz unweighted
Distortion THD, IMD
Frequency response -3dB
System bandwidth

Output meter
Peak meter

AC power supply B2T
Cables
Dimensions-shipping carton
Weight-packed

AC power supply B2T
Cables
Dimensions
Weight

AC power supply AD2022
Dimensions
Weight
Dimensions-shipping carton
Weight-packed

Twin cascode FET and bipolar low level input signal stages. High-voltage,
100% discrete, symmetrical Pure Class A

Transformer balanced low-ratio, 50, 150, 600 and 1k5 ohm input load selection
+36dB balanced XLR pin 2 hot (with -20dB passive attenuator)

+18dB at 100k ohms instrument input level, standard mono 1/4 inch jack

-20dB resistive pre-transformer primary, sealed silver relay
+48v regulated 50mA capability, sealed silver relay
Passive, variable from 30Hz to 185Hz @ 6dB per octave, sealed silver relay
Sealed silver relay on microphone input

+20dB to +64dB in 4dB steps
+/- 3dB variable conductive plastic potentiometer
+36dB balanced 600 ohms, DC coupled, discrete symmetrical Pure Class A
XLR connector, pin 2 hot

-126dB 150 ohm

-102dB

0.05% nominal
1Hz to 120kHz transformer limit
DC to 1MHz

High quality, illuminated analog VU meter 0dB = +4dB
Bi-color LED’s 0dB and +20dB peak detection circuit

External toroidal 100V to 240V, 50-60Hz selectable, 150 watts maximum
15lbs (6.8kg)
24 x 21.5 x 7.5 in (610 x 546 x 190mm)
25lbs (11.4kg) includes B2T power supply and cables

External toroidal 100V to 240V, 50-60Hz selectable, 150 watts maximum
1 x 8ft 4 pin ac cable, 1 x 8ft standard IEC cable included
5 x 7 x 3.25 in (127 x 177 x 83mm)
7lbs (3.2kg)

90V ac, 4 pin male power input connector, B2T required, internal DC regulation
19 x 12 x 3.5 in (482 x 305 x 89mm)
15lbs (6.8kg)
24 x 21.5 x 7.5 in (610 x 546 x 190mm
25lbs (11.4kg))