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Avalon Design U5
[AV-U5] U5 Mono Instrument & DI Preamplifier
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Avalon M5

Pure Class A Preamplifier

  • The U5 high-voltage DI-preamp combines a unique passive tone selector with a variable gain preamp and filter. The high input impedance accepts a wide variety of signal levels and instruments from acoustic guitars to high-output active bass guitars and keyboards. The U5 direct box is loaded with sonic character and user features professionals demand.


    The Avalon M5 Pure Class A microphone preamplifier is the most musical, low noise full function preamplifier available today. Designed to optimize absolute signal integrity and musical performance, the M5 combines an advanced transformer input stage with twin high performance Class A cascode FET and bipolar discrete amplifiers for sonic excellence unequaled by lesser designs. The M5 is ideal for vocal and acoustic instruments, active DI input for the direct recording of bass, guitars and keyboards.

    Features include state-of-the-art, balanced 100% discrete, Pure Class A signal amplifiers, practical user features and rugged hardware designed to deliver true high performance audio for many years.


    Avalon U5 DI-preamps have been in use around the world since 1995. They have found their way into the world's leading musicians rigs and recording sessions and been featured on thousands of the best selling (and sounding) albums and live performances.


    The U5 includes a variable gain Class A preamplifier to boost low level pickup signals and a high level speaker input for capturing the live sound of the instruments amplifier. Six passive tone-EQ curves are also included to enhance a variety of acoustic and electric instruments. A high-cut switch eliminates unwanted acoustic pickup and high frequency noise, while a headphone monitor amp has been included for personal listening. Twin DC coupled Class A output amplifiers drive both low level microphone preamp inputs and high level +4dB inputs for direct to tape recording or processing. The active-to-thru switch selects either the instrument input directly or sends the boosted-equalized signal to the amplifier via the front panel jack. A ground isolation switch eliminates any possible earth loop or AC buzz problems with complete safety.


  • • Pure Class A, 100% discrete design

    • Smooth musical detail and sonic excellence

    • Variable gain preamp to +30dB.

    • Dual microphone and line outputs

    • Hi-Z 3,000,000 ohm input impedance

    • Very low noise -100dB

    • High headroom +30dB

    • Six tone bank selections.

    • DC coupled Class A output for superior bass

    • High cut switch eliminates noise

    • LED active signal indicator

    • Headphone monitor output jack

    • Low distortion less than 0.5% THD and IMD

    • High level 400 watt speaker input

    • Active to thru selector - ground isolation switch

    • 100% discrete power supplies for audio path

    • Internal toroidal power supply for low noise

    • Long lasting, stainless steel hardware

  • Circuit Topology 100% discrete, high-voltage Class A
    Gain Switched 3dB steps, maximum gain +30dB
    Input Impedance 3 ,000,000 ohm unbalanced (single ended)
    Maximum Input Level +24dBu unbalanced, 400w speaker input
    Output Connectors (2) XLR type, pin 2 hot electronic balanced
    Maximum Output Level (Class A) +30dBu DC coupled, balanced 600 ohms (mic and line out)
    Headphone Output 0.5w into 600 ohms
    Noise 20kHz Unweighted: -100dBu minimum gain position
    Distortion THD, IMD: 0.1% at +10dB
    Frequency Response, -/+0.5dB 5Hz to 100kHz
    Frequency Response, -3dB 1Hz to 500kHz (input band limited)
    High Cut Filter: -3dB at 8kHz minimum phase design
    Tone Selector Six position rotary switch, all passive filters
    AC Power Internal toroidal AC supply
    Dimensions 8.5 x 3.5 x 12 in (216 x 88 x 305mm)
    Weight-Packed 12lbs (5.4kg)
    Rack mount kit (1) RM-1 Single U5 19 inch rack mount kit (holds one half rack unit)
    Rack mount kit (2) RM-2 Dual U5 19 inch rack mount kit (holds two half rack units)

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