A Simple One-Tube Compressor Circuit c.1953 – Preservation Sound
All-tube compressor and boost | Telecaster Guitar Forum
MU524 from Sound Skulptor
Sound Skulptor's MU524 Vari-Mu Tube Compressor is now available
Poor Man's Tube Compressor | GroupDIY Audio Forum
LA-2A OPTO7 CASE - DIY Racked - Personal Sound with Attitude
Amazon.com: OPHIR 3L Air Tank Kit with Adapters Tube for DIY Air Compressor Modification Airbrush Compressor Kit Hobby Model : Tools & Home Improvement