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T4B Opto Cell
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Front View
Rear View
T4B Opto Cell
Inside View
sold out


999.00 1,099.00

Inspired by the most iconic 1960's Optical Tube Compressor. A faithful, sonically period-correct reproduction of a LEGENDARY compressor using NOS Tubes and big, fat IRON!

“SOLD OUT” simply means we are busy building more! Follow us on IG/FB for the latest “INVENTORY UPDATES”. Each new, small batch of products goes up on the site @ 8PM EST on any given night!

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These are custom, hand built with care, one unit at a time. This is not a mass produced unit; true to AudioScape form!

The Opto Comp is our painstaking, high quality take on a famous 60's Optical Tube Compressor known for it’s sonic elegance, extremely musical compression and buttery smooth, hefty “box-tone” just by running audio through it tubes and transformers.

A faithful reproduction (with smart tweaks) of a LEGENDARY COMPRESSOR. This circuit is legendary for good reason and great care was taken to recreate it in true, sonically period-correct vintage tradition.

Utilizing the finest NOS Tubes in the audio path, NOS Carbon Comp resistors for added authenticity and unrivaled box-tone, and our own handmade custom T4B Opto-Attenuator (made just as the craftsman of yesteryear did) that is the HEART of the OPTO COMP.

One important addition is the high frequency control (limiter response) which we added to the front plate; you won’t know how you lived without this control being on the front! 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 true to 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 are used like the original from the 60's. Cornell Dubilier, Panasonic and Nichicon Capacitors are used throughout. NOS vintage tubes in the audio path, Custom-Wound Cinemag transformers.

We also utilize a custom made circuit board designed for lowest noise specs possible. We make our own T4B Opto-Attenuators using the highest grade photocells and replica EL Panels. We have OG Vintage UREI, Kenetek and Drip T4's we use for comparison which use similar components (carefully matched Silonex NSL5910, Replica EL Panels, etc).

The Opto Comp is great for individual inserts or groups as well as mix buss when using a stereo pair!

We hand build these one at a time so get it while you can! If its listed, it's built and ready to ship!
We have built PTP versions with original A-10/A24 transformers and can notice no sonic difference between those and this build (aside from the better noise specs from using our carefully designed, custom circuit board)

P.S. - We 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 us very deeply. This is not a device to skimp on in those crucial areas. Great components are necessary when building these, yet there are companies that mod these 2U ”‘clones" and change the components out that should have been 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, not too mention making circuitry fit in the 2U form factor. It's hard to expect detail and sonic accuracy when some major details are missing... (end tech rant)

AUDIOSCAPE offers a HASSLE-FREE, 2-YEAR WARRANTY included with EVERY unit we sell!


  • Handcrafted in the USA

  • Stylish 3U 19" Rackmount USA Made Case and Front Panel (aesthetically period-correct)

  • Premium, NOS Tubes in Audio Section - New Production Tubes Don't Cut it in this Circuit

  • AudioScape T4B Opto-Attenuator - Custom, Hand-Built and Sonically Period-Correct (true to vintage tradition).

  • Exclusive, Custom-Wound Input Transformer (exacting replica of the original)

  • Exclusive, Custom-Wound Output Transformer (exacting replica of the original)

  • Cornell Dubilier (CDE) Polypropylene Capacitors

  • Panasonic Radial Polyester Capacitors

  • NOS Allen-Bradley Carbon Comp Resistors

  • Carling (the BEST!) Toggle Switches

  • +40dB Make-up Gain

  • Analog dB Gain-Reduction Meter Perfectly Calibrated

  • Davies Original-Styled Knobs

  • Electronically Balanced +4dBu circuitry

  • Neutrik XLR Input and Output connectors

  • Alpha potentiometers and Rotary Switch

  • Stereo Link Cliff TRS Jack on Back

  • Internal 120V Power Supply / **240v Version Upon Request**

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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