BOSS EH-50 Stereo Enhancer Rack Unit Audio Processor from Japan

ART Tube PAC Tube Preamplifier / Compressor TubePAC Mic Preamp One Owner w’ Box

dbx 266xs Compresser

dbx Model 224 Rack-Mountable Tape Noise Reduction System, Analog, RCA, Bypass

Alesis M-EQ230 Dual 1/3 Octave Precision EQ Equalizer WORKS with Power Adapter

Boss CL-50 Pro Compressors Limiter Half Rack Guitar Effect Processor From Japan

ART Tube 255 Dual Channel Voiced Valve Microphone/Instrument Preamp, OPL, XLR

DBX 119 Decilinear Compression Expander Stereo Dynamic Range Enhancer (UNTESTED)