- “Harrison Ford” Filters
- 1073 Lite Mic Preamp/Eq
- Adiox Neumann W492 EQ
- Altronics DIY Parametric Equalizer
- AML ezP-1A Tube Equalizer
- Analog Allstars EQP-1S5 500-Series Pultec EQ
- Audiox 1695k Studer Eq
- Cheap’s 73 EQ
- DBD CEQ Equalizer
- dBDawg PreQ 500-series Preamp/EQ Kit
- Don Classics 250EQ
- Drip Electronics Pultec EQP1A EQ
- EZ1073 DIY Neve Preamp
- EZ1084 Equalizer
- G.TEN 500 series graphic eq
- Gyraf Calrec PQ1549 DIY Equalizer
- Gyraf G Pultec Passive EQ
- I.J. Research Sontec EQ
- IJ Research “Not Helios” 69 EQ
- IJ Research Stepped EQP Equalizer
- IOAudio EQP500 Equalizer
- LAZ EQN 1084 500 series Equalizer
- My Audio Lab Passive Tube PEQ-1
- Nite EQ3D DIY Equalizer
- PAiA Four Band EQ 9303
- PCB Grinder CTQ EQ
- PCB Grinder MSPQ76 Equalizer
- Peter C 5003 EQ
- Quad 8 444 Mastering/Mid-Side EQ
- Recording Magazine Active EQ
- Rude Tube IVORY Tube EQ/Distortion
- Ruff Records Poor Man’s EQP1A
- Ruffrecords EzTubeMixer
- RuffRecords REDD EQ
- Sound Skulptor EQ573 Equalizer
- TB550A Equalizer
- Ten81 Equalizer and Preamp
- Total Audio Control EQ ONE
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