Preamps

API 3124V, evolution of the 3124+, the famous 4-channel transistor mic/line preamp from API Audio.

ARTICLE N° 68478
  • API Audio 3124V
  • Classic API console circuit
  • RE-115K Mic Input Transformer
  • Uses API 2520 Op Amp
  • Variable Output Level Control
  • 3:1 Switchable Output Transformer
  • 4 x XLR Mic Inputs
  • 4 x Jack Instrument Inputs
  • Polarity Switch
  • -20dB Attenuation Switch
  • Mic/Line Select Switch
  • 48V Power Switch
  • Input Impedance: 1500 Ohms Mic, 470K Ohms Unbalanced, HI-Z in
  • Output Impedance: Channel Outputs Below 75 Ohms
  • Nominal Levels: XLR Channel Output +4 dBu
  • Stereo Output Level: Unbalanced: Nominal -2, Balanced: +4
  • Frequency Response: +0, -5, 10 Hz to 20 kHz (-.5 to 10 Hz)
  • EIN Noise: -129 Mic, -125 Unbalanced Actual
  • Measured Noise: Better than -91 dBm / Below nominal +4
  • Distortion: All outputs at +4 outputs, 0.03%, at +22, 0.09% maximum
  • Gain Range: 150 Ohms input 10 dB Min., 65 dB Max (including PAD) Unbalanced. Input 14 dB Min., 50 dB Max
  • VU meter calibrated for XLR outputs, OVU = + 4 dBu, (-12, -6, -3, 0, +3, +6, +18)
  • Controls: GAIN, PAD (20 dB), 48Volts, POL (polarity), MIC (mic/un-bal), VU, AC
  • Power consumption, idle: 19.2 watts
  • Size: 19" 1U rack (4.45 cm high x 27.94 cm deep)
  • Net weight: 4.7 kg
An evolution of the API 3124+, the 3124V is a compact, high-quality, 4-channel solid-state microphone preamp.
Like all API products, it features the proprietary output transformer.

The API 3124V now offers variable output level control and switchable 3:1 output transformer selection. The internal 48-volt phantom power is switchable for each channel, as well as -20dB attenuation for the mic inputs and Hi-Z instruments, all on the front panel.

The 3124V has a gain of up to 65dB. The front-panel Hi-Z inputs feed op amps directly, allowing you to amplify a low-level input such as a guitar or bass without the need for a transformer or DI. The high-impedance inputs can reach levels up to 20dB, ideal for keyboards and other high-level devices.
Canals
 4
Integrated AN/NA converter
 No
Compressor / limiter
 No
Phantom power
 Yes
Phase opposition
 Yes
De-esser
 No
Micro input
 4
Instrument input
 Yes
Audio outputs
 XLR
Vu-meter
 Yes
19" rack
 1U, Yes