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T4B Opto Cell
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Rear View
Inside View
T4B Opto Cell
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Here it is! inspired by a famous 60's Tube Compressor. A faithful reproduction of the beast at a great price! 

Free shipping to USA. All international orders please contact for shipping quotes.

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These are custom, hand built with care, 1 unit at a time. This is not a mass produced kind of unit.

Free shipping to USA. All international orders please contact for shipping quotes.

Up for sale is our high quality take on the famous 60's Tube Compressor. A faithful reproduction(with smart tweaks) of the beast at a great price! This compressor is legendary for good reason and great care was taken to recreate it in the true vintage tradition. One important addition is the high frequency control(limiter response) was added to the front plate which is very handy. This was a control on the back and set from the factory depending on what the application. This potentiometer was factory set for recording as “flat” side-chain response (clockwise). Increasing the resistance of this potentiometer by turning it counter clockwise will result in compression which is increasingly more sensitive to the higher frequencies. It filters out low frequencies to the T4B module so it compresses the lows less and changes the 'focus' of the compression. Very handy indeed to have up front as the demo video below points out! We also hand build our T4B’s here in the vintage tradition using the resistor across the panel(like seen on the vintage schematics) as opposed to the newer JBL era T4B’s used as a model for other manufacturers.


1/2 watt Carbon comp resistors were used like the original from the 60's, Cornell Dubilier, Panasonic and Nichicon Capacitors were used throughout. NOS vintage tubes in the audio path. Custom wound Cinemag transformers. A custom made circuit board designed for lowest noise specs possible. I also make my own T4B optical cells using the highest grade photocells and replica EL Panels. I have Kenetek and Drip T4's I use for comparison which use the similar components to construct theirs(matched silonex nsl5910, replica EL Panels). The LA-2A is great for individual inserts or groups and mix buss with a stereo pair. I hand build these one at a time so get it while you can. If its listed, it's built and ready to ship. I have built PTP versions with original A-10/A24 transformers and can notice no sonic difference between those and this build (besides the better noise specs from using the circuit board)

I have built many custom preamps, compressors, etc and had nothing but great results from those who have purchased form me. Please feel free to ask any questions. You can read my reviews for this and on other compressors I've built here on the site. Free shipping via Fed ex to the lower 48 U.S.A only. There is a 2 year warranty on this and any item purchased from audioscape.

P.S. I have seen some other companies that use a 2U high case with 1/4 watt metal film resistors and internal wiring that looks like it was put together like a tonka toy. This saddens me very deeply. This is not a device to skimp on in those crucial areas. Great components are necessary when building these, there are companies that mod these 2u ‘clones’ and put what components should be there to begin with and charge $1299. Some of these clones have things that shouldn't be there, opamps in the metering section, non original power supply scheme and modify tubes in the side chain all to save cost. and make circuitry fit in the 2u form factor It's hard to expect detail out of the sound when some major details are missing... (end tech rant)


  • Stylish 3U 19" Rackmount- original looking replica case

  • NOS tubes in audio section, new production tubes don't cut it

  • Internal 120V Power Supply and now 240v version upon request

  • Custom Built Vintage style Replica T4B in the vintage tradition

  • High quality Components throughout

  • Carling Toggle Switches

  • +40dB Make-up Gain

  • Analog dB Gain-Reduction Meter Perfectly Calibrated

  • Electronically Balanced +4dBu circuitry

  • Neutrik XLR Input and Output connectors

  • Alpha potentiometers and Rotary Switch

  • Stereo Link Cliff TRS Jack on back

  • Original Style Knobs

What are people saying?

"The Opto compressor is insane! Love this thing. Chris is very approachable and willing to answer any questions you have. Highly recommend."

"Wow, amazing! BETTER lows than our vintage unit- but identical tone otherwise"

"Super super super, I would buy it again for sure. Thank you!"

"Great Product and Service. I couldn't be happier!"

"Already right at home in the rack. love it"


Below is a video highlighting the sound of this lovely compressor. The main point of the video is to show the advantage of having the high frequency control on the front panel and the limit/compress switch function. I would recommend using headphones or critical monitors as a lot of the examples use subtle compression. It barely scratches the surface of what this compressor can do but should give a decent idea of functionality.




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