Refurbished - ADL 600 *

Product Details

2 input channels, each with:

  • Mic, line, and instrument inputs
  • High-voltage, Class A, dual-transformer, vacuum-tube preamp
  • Variable mic-input impedance (150, 300, 900, 1,500Ω)
  • Variable high-pass filter (40, 80, 120 Hz)
  • 8-position Gain switch
  • Backlit VU meter (output level)

Designed with famed tube-circuit guru Anthony DeMaria, the ADL 600 employs a Class A, discrete design with three vacuum tubes per channel and ±300V power rails for maximum headroom and superb tone. The 2U rack-mount preamp uses only the finest components, including custom-designed transformers; there are no op-amps or ICs in the signal path. The result is a world-class, ultra-low-noise preamp with a big, warm, smooth, clear, distinctive sound. 

Standard IEC Power Cable



Input Impedance

Microphone Selectable, 150/300/900/1500Ω
Balanced Line 2 kΩ
Instrument 100 kΩ

Maximum Input Level

Microphone (1500Ω, +20 dB Pad out) +5 dBu
Microphone (1500Ω, +20 dB Pad in) +25 dBu
Balanced Line +30 dBu
Instrument +30 dBu

Gain Range

Microphone (1500Ω, +20 dB Pad out) 18 dB to 72 dB
Balanced Line -12 dB to 40 dB
Instrument -5 dB to 42 dB


Noise Floor (all inputs, minimum gain) -95 dBu (A-weighted)
Microphone Equivalent Input Noise (EIN) -125 dBu (A-weighted)
Frequency Response 10 Hz to 45 kHz ±1 dB
Maximum Output Level +23 dBu (@ 0.5%THD+N)
Output Impedance 600Ω
Tube Complement (per channel) 1-12AT7A, 2-6922


Internal supply, standard IEC connector 115 or 230 VAC / 100W


Dimensions 2U rackmount
Height 3.5” (88.9 mm)
Depth 17" (431.8 mm)
Width 19” (482.6 mm)
Weight 28 lb. (12.7 kg)





Standard IEC Power Cable