Paia 9205 dual compressor. Dual channel 16-bit DIY compressor. With power supply and manual.
From the Paia catalog at the time...
A compressor is the most important, but most often overlooked tool in any studio. They're essential when recording real-world acoustic instruments, particularly human voice, where they guarantee the maximum possible signal level to the tape without worrying about overloading.
Our Dual Compressor is two independent compressor circuits in one package. Its specifications are as good as compressors get. Based on the SSM2120 Dynamic Range Processor IC, it features better than 90dB Signal to Noise ratio and an incredible lOOdB dynamic range with only .01% distortion at +10dB input. Requires +/- 15v @ 50mA power supply such as the BPS-15.