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ADL 600
2-Channel High Voltage Tube Mic Preamp

Sale Price: $2,195

Questions?
Call 978-744-2001 or email

Simply the Best

Designed by famed tube-circuit designer Anthony DeMaria, the ADL 600 employs a distinctive Class A, discrete design with three military-grade vacuum tubes per channel, operating with ±300V power rails for maximum headroom and superb tone. The dual-transformer design also ensures low-noise operation, with maximum common-mode rejection.

We use only the finest components, including switched attenuators, analog VU and LED meters, and custom-designed, proprietary transformers. There are no op-amps or ICs in the signal path. We went high-end all the way, right down to the last polypropylene film capacitor.

The result is an ultra-low-noise tube preamp with a big, warm, smooth, clear, distinctive sound. It produces big, smooth, and articulate vocals; deep and tight bass guitars; and rich, full mixes. It makes virtually anything you run through it sound better.

Maximum Flexibility

Beyond superb sound quality, the ADL 600 is special because of its ease of use and flexibility. Each of the two input channels has mic, line, and instrument inputs, and you can select among four mic-input impedances, so the preamp works great with any type of microphone. The high-pass filter employs a rotary switch with three filter settings (40 Hz, 80 Hz, and 120 Hz at 6 dB/octave) for controlling room rumble and low-frequency noise.

The input-gain attenuator is a military-grade rotary switch that provides 5 dB stepped increments and a total preamplifier gain of over 73 dB. The output stage is controlled by a fully variable attenuator that delivers ±10 dB of fine-tune trim adjustment, enabling you to dial in the perfect gain structure for any application. And of course, you get 48V phantom power and a 20 dB pad, controlled by big, sturdy, military-grade switches.

We didn’t skimp on metering either. Fast-acting, eight-segment LED meters accurately detect fast transients and peaks. Large, backlit analog VU meters display output levels, and a -6 dB switch lets you meter particularly hot signals.

Technical explanations are well and nice, but hearing is believing. Try the ADL 600 yourself and experience the thrill of using the world’s finest tube preamp. That will tell you all you need to know.

Features

  • 2 input channels, each with:
    • Mic, line, and instrument inputs
    • High-voltage, Class A, dual-transformer, vacuum-tube preamp
    • 3 military-grade vacuum tubes per channel
    • Input-source select
    • Variable mic-input impedance (150, 300, 900, 1,500Ω)
    • Variable high-pass filter (40, 80, 120 Hz)
    • 8-position Gain switch
    • Variable Trim adjustment for final stage
    • 48V phantom power
    • -20 dB pad
    • Polarity-reverse switch
    • Backlit VU meter (output level) with -6 dB switch (for metering hot signals)
    • 8-segment, fast-acting LED metering (peaks and transients)
    • > 73 dB of gain
  • Input/Output
    • 2 unbalanced ¼” instrument inputs (front panel)
    • 2 transformer-balanced XLR line inputs
    • 2 transformer-balanced XLR mic inputs
    • 2 transformer-balanced XLR line outputs
  • Physical
    • 2U 19” rack-mountable, rugged steel chassis
    • Internal power supply with standard IEC connector
    • Chassis ground link connectors (lift chassis ground)

  • Specifications

    Input Impedence
    Microphone
    Selectable, 150/300/900/1500 Ohm
    Balanced Line
    2KOhm
    Instrument
    100KOhm
    Maximum Input Level
    Microphone (1500Ohm, +20dB Pad out)
    +5dBu
    Microphone (1500Ohm, +20dB Pad in)
    +25dBu
    Balanced Line
    +30dBu
    Instrument
    +30dBu
    Gain Range
    Microphone (1500Ohm, +20dB Pad out)
    18dB to 72dB
    Balanced Line
    -12dB to 40dB
    Instrument
    -5dB to 42dB
    Noise Floor (all inputs, minimum gain)
    -95dBu (A-weighted)
    Microphone Equivalent Input Noise (EIN)
    -125dBu (A-weighted)
    Frequency Response
    10Hz to 45KHz +/- 1dB
    Maximum Output Level
    +23dBu (@ 0.5%THD+N)
    Output Impedance
    600 Ohm
    Tube Complement (per channel)
    1-12AT7A, 2-6922
    General
    Input Voltage (factory configured)
    115 or 230 VAC / 100Watts
    Dimensions
    3.5" (H) X 17.0" (D) X 19.0" (W)
    Weight
    28 lb