500 Series Microphone Preamp

The B12A MkII 500 packs the same punch as its ½ rack cousin, but in the convenient and flexible 500 series format. The API-style design features a delicious CineMag input transformer, serves up huge portions of low-noise gain, and has the same classic American rock sound that the original API 312A is known for! Get ready to fill your lunchbox, ‘cause once you go Black Lion Audio, you never go back!

https://blacklionaudio.com/product/b12a-mkii-500/

No info about availability.