SKU: 84039513623

Union Tube & Transistor Lab Compressor *Beancounter Edition*

Sale price$105.75 Regular price$117.50
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Description

Union Tube & Transistor Lab Compressor *Beancounter Edition*Maker: Union Tube & Transistor Model: Lab Compressor Condition: New Description: The LAB is an optical compressor. It uses custom optocouplers to achieve up to 30dB of musical sounding compression. We loved how in the recording studio even with tons of compression the old optical compressors such as the LA 2A, the LA 3, the LA 4 sounded smooth and natural. The essence of the LAB's sound comes from the fast attack and slow release times of the custom

Maker: Union Tube & Transistor

Model: Lab Compressor

Condition: New 

 

Description:  

The LAB is an optical compressor. It uses custom optocouplers to achieve up to 30dB of musical-sounding compression.

We loved how in the recording studio even with tons of compression the old optical compressors such as the LA-2A, the LA-3, the LA-4 sounded smooth and natural.

The essence of the LAB's sound comes from the fast attack and slow release times of the custom optocoupler. The optocoupler's behaviour is quite complex, and program-dependent. It can't be modelled with simple resistor-capacitor networks. We wanted the pure response of the optocoupler to define the LAB's dynamics, and not supplement that with RC filtering.

To that end, we tried out just about every off-the-shelf optocoupler on the market, but ended up designing and manufacturing our own custom units. There's an interplay between dynamics, noise floor, distortion, and available compression on the one hand, and the opto's electrical parameters on the other. Since nothing commercially available fit the bill, we built our own.

With just two controls – compression and gain make-up – the LAB is fast and simple to use. It sounds great on bass and electric guitar, and the noise floor is impressive – quiet enough for studio use. It really shines on acoustic guitar, vocals and drums.

 

LAB Optical Compressor Specifications

Power Requirements +9VDC @40mA

Input Impedance 1MΩ

Output Impedance 100Ω

Frequency Response 20Hz–20KHz ±0.1dB

Maximum Input Level +7.5dBu

Maximum Output Level +10.0dBu

Compression/Gain-makeup 30dB

Noise Figure (Rs=10K) 3dB

For studio use you will need to attenuate going in and boost coming out of the LAB.

 

The Bean Counter version of the LAB has a non-colour changing LED and no special packaging.





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Exchange/Return Notes
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SKU: 84039513623

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Game time
Fort Morgan, US
★★★★★ 4
Would buy again
Color: Black, Size: 2 Rolls
I love it but wish the tubes the bracelets slide onto were a bit smaller. It’s difficult to fit cuffs on without having to bend them and I don’t even have small wrists. Very pretty and fits a lot of cuffs and bracelets.
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Reviewed in the United States on January 5, 2026
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Jenny
Draper, US
★★★★★ 5
Love it!
Color: White, Size: 2 Rolls
A very nice bracelet holder. It's much better than I anticipated. It holds everything perfectly. There is enough room on the bottom to store a lot of different things. The bracelet hold there feels sturdy, and I love the color. I like how I can look at the bracelet through the window.
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Reviewed in the United States on March 18, 2026
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The Fixer
Pawtucket, US
★★★★★ 5
See what you’re looking for at a glance
Color: Black, Size: 2 Rolls, Color: Black, Size: 2 Rolls
Impressed. This is a nice case. You can slip the bracelets on without any fuss. While I haven’t finished filling this one, I’m already considering a second case for watches and ankle bracelets. It’s convenient to see your items rather than digging for them. Nothing gets tangled either. There’s room for storing additional items below the two display rods.
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Reviewed in the United States on December 31, 2025
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Verified Purchase
B.Farrell
Charlottesville, US
★★★★★ 5
Perfect little jewelry box
Color: Beige, Size: 2-Layer
My daughter loves this jewelry case. Her necklaces store nicely as it has a little pocket to secure the length of different pieces. She likes the modern color and style of the little hardware. Great quality for the price!
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Reviewed in the United States on April 20, 2026
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Joseph Bucci
Battle Creek, US
★★★★★ 5
Pretty and delicate piece of jewelry
Color: Blue, Size: 2-Layer
Very nice lots if storage for jewelry nice jewelry box, nice price
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Reviewed in the United States on April 8, 2026

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