ART Solo VLA Multi-voice Tube Optical Compressor

ART Pro Audio Solo VLA Multivoice Tube/OPTO Compressor

DBX 286A Mic Preamp Processor Vocal Channel Strip Compressor Enhancer U271273

Focusrite Platinum Trackmaster vocal & instrument channel Tested/Works w/chord

ART Dual MP - Two Channel Tube Microphone Preamp Model 254 See Photos

ART SOLO STUDIO Rackmount Single-Channel Multi-Voice Optical Tube Compressor

ART SOLO VLA Single-Channel Multi-Voice Rackmount Tube Opto/Compressor

DBX Professional Products 386 Dual Vacuum Tube Preamp With Digital Output USA