ADR AUDIO & DESIGN (RECORDING) LTD.
 - E560-RS
 - F600 Compressor/Limiter (diode bridge, 1965)
 - F600-R Compressor/Limiter (fet)
 - F600-RS Limiter (fet)
 - F601-R Super-Dynamic Limiter-Mono Rack Mount
 - F601-RS Super-Dynamic Limiter-Stereo/Dual Mono Rack Mount
 - F690 Music-Voice Ratio Limiter - consists of a standard F600 Broadcast Limiter fitted with a voice operated threshold switching circuit
 - F690-RS - Music/Voice Ratio Limiter-Stereo/Dual Mono Rack Mount. The stereo F690-FS can be well used in a mono installation with one channel for voice and the other for the music voice-over control. ln other respects the specification is identical to the F600 Broadcast Liniter
 - F700 COMPRESSOR (When The Levee Breaks)
 - F760X-N COMPEX-LIMITER Mono "N" Module
 - F760X-R COMPEX-LIMITER Mono Rack Mount (1971)
 - F760X-RS COMPEX-LIMITER Stereo/Dual Rack Mount (1971)
 - F769X-R VOCAL STRESSOR Mono Rack Mount
- TRANSDYNAMIC Processor - Tri-Band Processor
 - SCAMP 01 COMPRESSOR-LIMITER (Supersedes F700 Series)
 - Ex-press Limiter
 - Gemini Easy Rider
 - Gemini Compact STEREO COMPRESSOR LIMITER
Altec Lansing
 - A-322 C LIMITER AMPLIFIER - http://www.vintagewindings.com/gen%20pop/8299543VW8335/ProAudio1/Altec%20A-322-C%20Compressor%20Manual.pdf
 - 436 A/B/C Compressor Amplifier (1954) - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/A/Altec%20Lansing/altec-lansing-436a-compressor-amplifier-schematic.pdf
 - 438 A/B/C (vari-mu, tube)
 - 444 B Compressor Amplifier (1958) - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/A/Altec%20Lansing/altec-lansing-444b-compressor-amplifier-schematic.jpg
 - 1591 A
 - 1612 A/B LIMITER AMPLIFIER
 - 1712 A (solid state)
 - 9473 A LIMITER AMPLIFIER (1971) - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/A/Altec%20Lansing/Altec%209473A%20Compressor.pdf
API 525, 2500
A.W.A. G7201, G54639 LINE LIMITING AMPLIFIER, 2G54250, 2G58250, 1G64830 BIG-1 PROGRAM CONTROL AMPLIFIER
BBC AM6 /1 (1970), AM6/3 (1971), AM6/7 (1972), AM6/9 (1972), AM6/11 (1973), AM6/14 (1974), AM6/16 (1976), AM6/17 // http://www.bbceng.info/ti/eqpt/
Boss CL-50 Pro
BSS
Cadac A505
Calrec CL-1070, CL-1170, CL-1204 (Incorportating BBC AM6/17/A), CL-1508; DL-1508, DL-1656, DL-2638, DL-2934, DL-3678; RQD-6400; PQ-1625
Columbia Broadcasting System CBS Laboratories
 - AUDIMAX I 440 automatic peak controller (1967, tube) - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/V%20Misc/Volumax%20400.jpg, http://radios.2y.net/CBS/Audimax_440/Audimax_440.jpg
 - AUDIMAX II 441 (Added tube pre-amplifier to 440)
 - AUDIMAX II 442 (Improved version of 441) - AUDIMAX II 443 (Stereo strapping version of 442 (required two 442's))
 - AUDIMAX III 444 (Transistors + 8056 nuvistor tube) - Classic AM gain controller. - http://radios.2y.net/CBS/Audimax_444/Audimax_444.jpg
 - AUDIMAX III 445 (Stereo version of 444)
 - 710 automatic loudness controller
 - AUDIMAX 4440 (1975, Mono, All transistorized, smaller, improved S/N version of 444) - Classic AM gain controller.
 - AUDIMAX 4450/A (1975, Stereo, All transistorized, smaller, improved S/N version of 444)
 - Volumax 400	All transistorized, introduced at same time as Audimax III 444 - Classic AM processor.  Legendary in performance. - http://radios.2y.net/CBS/Volumax_400/Volumax_400.jpg
 - Volumax 410 FM version of 400
 - Volumax 411 Stereo strapping version of 410 (required two 410's)
 - Volumax 4000/A Smaller, improved S/N version of 400 Classic AM processor.  Legendary in performance.
 - Volumax 4100 Smaller, improved S/N version of 410
 - Volumax 4110 Stereo version of 4100
 - Volumax 4111 Improved version of 4110
 - Volumax 4300 Added automatic peak polarity sensing/switching IC to the 4000 Classic AM processor, especially for talk/sports programming.  Not only corrected out of phase microphones, but even syllable phase changes! Legendary in performance. - http://radios.2y.net/CBS/Volumax_4300
Collins Radio Company
 - 26C LIMITING AMPLIFIER (1939)
 - 26C-2 LIMITING AMPLIFIER
 - 26J-3 AUTO-LEVEL COMPRESSION AMPLIFIER
 - 26U-1/2/3 PEAK LIMITING AMPLIFIER
 - 26W LIMITING AMPLIFIER (1955)
 - 356E-1 (1960)
COMPEX F760X-RS
DBX
 - 160
 - 165
DECCA "GERMANIUM/SILICON"
DR COMPRESSOR/LIMITER
EMI TG12413, EMI RS124 (modded Altec 436B)
ELEKTROMESSTECHNIK WILHELM FRANZ EMT 156 PDM COMPRESSOR, 257 LIMITER, 261 LIMI-COMP, 256 COMPRESSOR, 266X TRANSIENTEN LIMITER, 277 DX LIMITER
Executone M270RM (Opto)
Fairchild Recording Equipment Corp. 600 CONAX, 602 CONAX, 660, 666/A COMPRESSOR, 670
Federal AM-864/U (1957)
Focusrite ISA 130, Red 3, Blue 230 Dual Compressor Limiter, BLUE 330 Compressor & Limiter
Gates Radio Co., Subsidiary of Harris Intertype Corp.
 - SA-38
 - SA-39A/B LIMITING AMPLIFIER - http://bh.hallikainen.org//wiki/uploads/GatesSa-39a.pdf
 - M-3529
 - M-5167 STA-LEVEL AMPLIFIER (1956) - http://bh.hallikainen.org//wiki/uploads/GatesStaLevel.pdf, http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/M-5167.pdf
 - M-5546 LEVEL DEVIL AMPLIFIER (1958) - http://bh.hallikainen.org//wiki/uploads/GatesM5546.pdf
 - M-6314A TRANSISTORIZED PROGRAM/AUTOMATIC GAIN CONTROL AMPLIFIER
 - M-6543 SOLID STATESMAN LIMITER (1968) - http://bh.hallikainen.org//wiki/uploads/GatesM6543.pdf
 - M-6629 SOLID STATESMAN AGC AMPLIFIER
General Electric Co.
 - BA-5A LIMITING AMPLIFIER - http://www.waltzingbear.com/Schematics/Misc/GE_BA_5.htm
 - BA-7A LIMITING AMPLIFIER
 - BA-9A/B UNI-LEVEL
Helios F760
INOVONICS 200 Average and Peak Responding Limiter, 201 Average and Peak Responding Limiter, 220 Audio Level Optimizer, 221 Audio Level Optimizer II
I.T.A. ELECTRONIC AGC-1A, LA-1B, AL-1 AUTO-LEVEL (1959)
Joe Meek
Langevin 119-A PROGAR AMPLIFIER (1940's), AM-7A, AM-5301 Leveline Amplifier
ELECTRONIC SYSTEMS ENGINEERING CO. ESECO LIMPANDER LE3 LIMPANDER, LE 33 LIMITER-EXPANDER, LIMPANDER LE 350B BROADCAST AUTOMATIC AUDIO CONTROL (1960's), LIMPANDER HI-INTELLIGIBILITY AMPLIFIER (1960-63)
LOMO 600u-17, 9Y-06, 97-06 (1972)
MCI Fairchild Clone (1964)
MXR mini-limiter, dynamic expander
Neve
- 2252 (1960s, germanium)
- 2253
- 2254
- 2254a - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/N-O/Neve/neve2254aSchem.jpg
- 2254e - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/N-O/Neve/neve2254eSchem.jpg
- 2262
- 2264 (2264 family have a square motherboard that slots into the extruded top/bottom covers (unique amongst 45 series modules) and the trim controls are on the module rear panel)
- 32253
- 32264/a
- 33314/A (plug-in type, requires external meter, has an adapted circuit board to have a 29 pin Varicon connector fitted to it and the preset pots are mounted on the circuit board)
- 33609 ISS. 12 (the 33314 boards were used in the early 33609's)
- 33609 A
- 33609 B (stereo, 2U, internal PSU) (Marinair Transformers)
- 33609 C (different motherboard with Belclare transformers)
- 33609 D (The /*D was added as they substituted the B640 output amp for the B340/440 from their 1081 module)
- 33609 J (same motherboard but with extra logic IC's and relays to cope with the two ugly switches that were added to satisfy Genenal Traders their Japan (hence /J) dealers who were major sellers of the product)
- 33069 JD (600 ohm input impedance instead of the original's 10Kohm bridging impedance)
- 33610 (mono, 2U, internal PSU)
- 33611 (stereo, 2U, external PSU)
- 33612 (mono, 2U, external PSU)
- 33615 (mono, 1U, LED gain reduction indication)
- 34628 (stereo, 2U, external PSU) - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/N-O/Neve/neve_compressor.jpg, https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/N-O/Neve/NEVE%203%20&%20FOCUSRITE%20Dave%20Library%207.pdf
- 81069
- 83065 (plug-in type, BBC-design am6/17 replacements)
- 83605 (console version)
Orban 526A
PYE T.V.T. LTD. 3755 AMPLIFIER DETECTOR, 4060/04 COMPRESSION AMPLIFIER, 845712/00 COMPRESSION AMPLIFIER, 845712/03, 845751/01,  845753/04 COMPRESSION UNIT LDM 0091/05
Publison CL-20 C
quad/eight electronics
 - AUTO-MIX 2b - https://www.proaudioeurope.com/info/classic-brochures/quad-eight-auto-mix-2b-dynamics-module
 - AUTO-MIX 3b (1970s)
 - CL-22
Quindar Electronics, Inc.
 - QCA-2 (1967)
Raytheon Mfg. Co. Communication Div. Chicago
 - RL-10 LIMITING AMPLIFIER (1946) - http://www.engineeringradio.us/blog/2013/08/the-raytheon-rl10-limiting-amplifier/
RCA
 - BA-6 A
 - BA-25 A AGC PROGRAM AMPLIFIER - http://www.coutant.org/rcaba25a/index.html
 - BA-28
 - BA-43
 - BA-45 AGC ("Opto")
 - BA-46 LIMITER ("FET")
 - BA-86 A
 - BA-96 A
 - Comex
 - ND-42 AUTOMATIC AUDIO GAIN CONTROL
Shure Level-Loc AUDIO LEVEL CONTROLLER (1960s)
Spectra Sonics 610 (1964)
SSL 4000E/G Quad Comp
TRI-TRONICS CA-1782
UNIVERSAL AUDIO Inc.
 - 175A LIMITING AMPLIFIER - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Universal%20Audio%20175A.jpg
 - 175B LIMITING AMPLIFIER (1965) - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/UREI%20175B%20Front%20End.jpg, https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/UREI%20A175%20Limiting%20Amplifier.jpg
 - 176 LIMITING AMPLIFIER - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Universal%20Audio%20Ua%20176.jpg
 - 177 LIMITING AMPLIFIER - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Universal%20Audio%20Ua%20177.jpg
 - 1176 L-N SOLID STATE LIMITING AMPLIFIER - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/UREI%201176%20Compressor.gif, https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Urei%201176.zip, https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/urei1176sch.gif
 - 1178
 - LA-2A - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/UREI%20LA-2.jpg, https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/urei.gif
 - LA-3A
 - LA-4A - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/UREI%20la-4a.jpg, https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Urei%20La-4.jpg
 - LA-5 - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Urei%20La5%20Audio%20Leveler.pdf
 - BL-40 Modulimiter - https://www.schematicsforfree.com/archive/file/Audio/Products/Professional%20Audio/U-V/UREI/Urei%20Bl-40.zip
VALLEY PEOPLE 610 Dual Compressor/Expander (1980's)
Western Electric 126C, 1126A AMPLIFIER http://www.audiosharing.com/archive/western/we_amp/pdf/No.1126-A.pdf (also as Signal Corps U.S. Army AF AMPLIFIER AM-186 A/FR Industrial Television Inc.), RA-1217 AMPLIFIER, RA-1594 AMPLIFIER (1935)
WSW R.Ela.Verst. 74b / 601 430 B DYNAMIKBEGRENZER (solid state), WSW 601 430 S DYNAMIKBEGRENZER (solid state), 601 431 A/B/C DYNAMIKBEGRENZER (solid state), 601 432, 601 433 A/B/C LIM (solid state)