Avalon Design AD2022 Dual Mono Pure Class A Preamplifier (Black)

Avalon Design AD2022 Dual Mono Pure Class A Preamplifier (Black)

Avalon Design AD2022 Dual Mono Pure Class A Preamplifier (Black)

B&H # AVAD2022BL MFR # AD2022-BL
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Expected availability: 7-14 business days

This item is noncancelable and nonreturnable

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  • 1Description

The AD2022 Dual Mono Symmetrical Pure Class A Preamplifier from Avalon Design includes the original sonic capabilities and transparency of M2, M22, and M5 Preamplifiers and 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, polytetrafluoroethylene / silver wiring, and double-plated circuit boards for superior low level signal transfer.

The AD2022 Preamplifier incorporates an advanced, high-performance microphone transformer. 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. Input signal selector, high pass filter, polarity-phase reverse, 48V power, and the 20 dB input attenuator 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.

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 high level headroom capability, improves transient response, and doubles the internal bandwidth of the high performance pure Class A signal amplifiers.

The high-current, DC-coupled, discrete Class A amplifiers are utilized for the output drive interface with 36 dB capability into all known loads. Two large, high-quality analog VU meters indicate accurate signal readings, while bi-color LEDs offer peak indication at 0 and 20 dB.

Symmetrical Pure Class A design, two channels
Microphone and Hi-Z instrument inputs
Gain switched 4 dB steps plus ±3 dB fine output trim
Selectable microphone input impedance matching
126 dB EIN low noise
High quality, low-ratio, balanced input transformer
Balanced, high-current Class A output to 36 dB
Large illuminated analog VU meters and twin peak LEDs
Regulated phantom power supply of 48V
Input polarity phase reverse
High headroom 36 dB input before overload
20 dB input pad for high level signals
Sealed silver relays for all signal routing
External 150W AC toroidal power chassis
Fully discrete Class A-regulated audio power supplies
Deep, musical sound-stage, transparent amplification
In the Box
Avalon Design AD2022 Dual Mono Pure Class A Preamplifier (Black)
  • External Toroidal B2T Power Supply
  • 8.0' (2.4m) 4-Pin Power Cable
  • 8.0' (2.4m) AC Cable
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description
    Topology Circuit: Twin cascode FET and bipolar low level signal amplifiers, high-voltage, 100% discrete, symmetrical Pure Class A
    Input Type and Load: Transformer balanced low ratio, 50, 150, 600, and 1,500 Ω input load selection
    Mic Maximum Level: 36 dB balanced XLR 2-pin hot (with -20 dB passive attenuator)
    Maximum Level Instrument: 18 dB at 100 kΩ instrument input level, standard mono 1/4" jack
    Input Attenuator -20 dB resistive pre transformer primary, sealed silver relay
    Phantom Power 48 V regulated 50 mA capability, sealed silver relay
    Filter High Pass Filter: Passive, variable from 30 to 185 Hz @ 6 dB/octave, sealed silver relay
    Polarity Reverse: Sealed silver relay on microphone input
    Gain Range Input: 20 to 64 dB (in 4 dB steps)
    Output: ±3 dB variable conductive plastic potentiometer
    Output Level Maximum: 36 dB balanced 600 Ω, DC coupled, discrete symmetrical Pure Class A
    Output Type XLR connector, 2-pin hot
    Noise -126 dB 150 Ω (EIN unweighted)
    -102 dB (20 kHz unweighted)
    Distortion THD, IMD: 0.05% nominal
    Frequency Response -3 dB: 1 Hz to 12O kHz transformer limit
    Bandwidth System: DC to 1 MHz
    Meter High quality, illuminated analog VU meter (0 dB equals to 4 dB) (output meter)
    Bi-color LEDs
    0 and 20 dB peak detection circuit (peak meter)
    Power Supply B2T: External toroidal 100 to 240 VAC, 50 to 60 Hz selectable, 150 W maximum

    Power supply included.

    Dimensions Preamplifier Unit: 19.00 x 12.00 x 3.50" (482.60 x 304.80 x 88.90 mm)
    B2T Power Supply: 5.00 x 7.00 x 3.25" (127.00 x 177.80 x 82.55 mm)
    Weight Preamplifier Unit: 15.0 lb (6.8 kg)
    B2T Power Supply: 7.0 lb (3.1 kg)

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