London, United Kingdom
About this listing
Avalon AD2022 Dual Mic Preamp (Used)Serviced. Excellent condition with light signs of use. No original box. Includes 3 months warranty.The AD2022 is Avalon’s fourth generation of fully discrete, symmetrical Pure Class A microphone preamplifiers. The dual mono 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.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 amplificationMirophone InputThe 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.Symmedtrical Pure Class A DesignTwo 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 & MeteringHigh-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.SpecificationsCircuit Topology: _x0009_Twin cascode FET and bipolar low level signal amplifiers, high-voltage, 100% discrete, symmetrical Pure Class AInput Type and Load: _x0009_Transformer balanced low-ratio, 50, 150, 600 and 1k5 ohm input load selectionMaximum Mic Level: _x0009_+36dB balanced XLR pin 2 hot (with -20dB passive attenuator)Maximum Instrument Level _x0009_+18dB at 100k ohms instrument input level, standard mono 1/4 inch jackInput Attenuator: _x0009_-20dB resistive pre transformer primary, sealed silver relayPhantom Power: _x0009_+48v regulated 50mA capability, sealed silver relayHigh Pass Filter: _x0009_Passive, variable from 30Hz to 185Hz @ 6dB per octave, sealed silver relay.Polarity Reverse: _x0009_Sealed silver relay on microphone inputGain Range Input: _x0009_+20dB to +64dB in 4dB stepsGain Output Range: _x0009_+/- 3dB variable conductive plastic potentiometerMaximum Output Level: _x0009_+36dB balanced 600 ohms, DC coupled, discrete symmetrical Pure Class AOutput Type: _x0009_XLR connector, pin 2 hotNoise EIN Unweighted: _x0009_-126dB 150 ohmNoise 20kHz Unweighted: _x0009_-102dBDistortion THD, IMD: _x0009_0.05% nominalFrequency Response -3dB: _x0009_1Hz to 120kHz transformer limitSystem Bandwidth: _x0009_DC to 1MHzOutput Meter: _x0009_High quality, illuminated analog VU meter 0dB = +4dB.Peak Meter: _x0009_Bi-color LED’s 0dB and +20dB peak detection circuit.AC power supply B2T: _x0009_External toroidal 100V to 240V, 50-60Hz selectable, 150 watts maximum.Cables: _x0009_90V ac, 4 pin male power input connector, B2T required, internal DC regulationDimensions: _x0009_19 x 12 x 3.5 in (482 x 305 x 89mm)Weight: _x0009_15lbs (6.8kg)Dimensions – Shipping Carton: _x0009_24 x 21.5 x 7.5 in (610 x 546 x 190mm)Weight – Packed: _x0009_25lbs (11.4kg)
Price£2,385
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