Warm audio WA12 MKII

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Preamp

The WA12 MKII is a completely discrete, high voltage, dual-transformer microphone preamplifier designed for high gain (+71dB), high headroom, low noise, and an exciting sonic performance – great for all types of recording applications. A high quality mic preamp is one of the most critical pieces needed to achieve the elusive ‘larger than life’ sound, and the WA12 MKII is more than capable of delivering.

The WA12 is based around a discrete op-amp, the X731, which is our own reproduction of the vintage classic Melcor 1731, considered by some to be the warmer predecessor to the modern 2520-style op-amp. The X731 can achieve vibrant, clean and lifelike tones; but can also be driven into mild saturation at much higher gain levels. The effects can be subtle, but very pleasing to the ear.

Technical sheet

Type of preamp Transistor

Utilizes premium grade input and output USA CineMag transformers.
71db of Gain, fully discrete signal path.
Utilizes a discrete 6-pin socketed 1731 style opamp. Can be replaced with other 6-pin "2520 foot-print" opamps for varying tone/flavor.
TONE button – Switches the input impedance from 600 ohms to 150 ohms. Changes the tone of both the mic and HI-Z inputs.
2 Meg Ohm True HI-Z input on front panel. Sends instrument signal through entire circuit including both Cinemag Transformers and the discrete opamp.
Great for guitars, bass, keyboards and other instruments that have a 1/4? output jack.
48 volt Phantom Power.
Output attenuation control (after the CineMag output transformer) allows for driving the preamp and transformers into saturation.
LED Meter gain indication.
20db pad.