The API 312 is a classic 1970's single-channel microphone preamplifier and line / booster amplifier using the revered 2520 op-amp.

The iconic 1970's-built API 312 Preamplifier has been replicated by many manufacturers throughout the years. However, none can match the sonic qualities of this classic unit.

The 312 features the 2503 output transformer, Cinemag input transformers and the highly sought after 2520 Op-Amp, giving the unit its unmistakeable sound. These are extremely versatile units capable of wraping its sound onto any source signal, however, they are most famed for their use on drums.

The API 312 boasts 15 to 65 dB of gain, a balanced frequency response and low THD values. 

Applications: Microphone Preamplifier; Line Amplifier; Booster Amplifier

Gain: Externally adjustable from +15 to +65 dB

Frequency Response: ±0.5dB, 30 Hz to 20 KHz @ rated output

Noise: Equivalent to an input of -129dBm, 20 Hz to 20 KHz unweighted

Distortion: ±16V operation: 0.05% THD typical at +18dBm output 30 Hz to 20 KHz

Clipping Level: 3% THD ±16V operation: +26dBm (output 1 into 600 Ohms); +30 dBm (both outputs in series)

Input: Bridging Transformer

Input Impedance: 1 K ohm, typical


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