XFMR DIY Projects: Magnecord PT6-J Made into Preamp plus Vari-Mu Tube Compressor / Limiter "Pre+Limiter"
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Analog Man CompROSSor pedal with RYCK mod — Anatomy of Guitar Tone
PC-2A Tube Compressor - Effectrode
Amazon.com: OPHIR 3L Air Tank Kit with Adapters Tube for DIY Air Compressor Modification Airbrush Compressor Kit Hobby Model : Tools & Home Improvement
DIY Racked 175B VariMu Case - DIYRE Wiki
Hagerman Compressor Review
V-COMP+ "DELUXE 6386 EDITION" MU COMPRESSOR — Vintage Pro Audio Equipment | AudioScape Engineering Co.