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.
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 AD2022 will make your
recordings musical masterpieces!
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