- APP Studio Ing. I/O Board
- Bo Hansen DI
- Charles R. Thompson Budget Studio Monitor Isolation Stands
- ClassicAPI 2 Channel Summing Amplifier and Booster
- ClassicAPI 4 Channel Summing Amplifier
- ClassicAPI BB2521 Hybrid Opamp
- ClassicAPI Discrete Voltage Follower
- Direct Tube Preamp PCB
- DIY-Racked DR-2402 API Summing Amplifier
- DIYRE L2P Passive Line Attenuator
- DIYRE SB2 Passive Summing Mixer
- Eli-Audio “Iron Ore” concept.
- ESP Project 50 Microphone Circuit Test Oscillator
- ESP Project 96 – 48V Phantom Power Supply
- Expat Audio Mic Pre Frontend
- GEO-Fex Transformer Winding Short Tester
- Hakanai Stereotype Mk II Summing Mixer
- Hamptone HPDI
- Inline Attenuator Pad
- Jensen Amp Interface
- JLM dINgO Balanced/Unbalanced Interface
- JLM FET & Opamp DIs
- JLM Go Between Preamp Interface
- JLM INX5 Balanced/Unbalanced Interface
- JLM Power, Pad, and XLR Kits
- JLM Sontec Opamp Adaptor
- KA Electronics Precision Mid Side MS Matrix
- LINE2AMP Reamping Box
- NYD Passive Summing Box
- PAiA 9605K Headphone Buffer Amp Kit
- PAiA K89 Stereo LED VU Meter Kit
- PCB Grinder “Head Grinder” Headphone Amp
- PCB Grinder Majestic Buzz 16-2 Summing Mixer
- ProHarmonic/AudioTechnology Passive Monitor Controller
- Recording Magazine Amp Interface
- Ruffrecords EzTubeMixer
- Ruffrecords Passive Summing PCB
- Serpent Audio Send ‘N Blend Mix Controller
- Seventh Circle D11 DI
- Sound Skulptor DI02
- Sound Skulptor MC624 Monitor Controller
- TB Audio TBFX 500-series interface
- Whistle Rock Audio HZ51x DI
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