top of page
shutterstock_393664369.jpg

IGS Audio Tubecore 3U 
- Vari-Mu Mastering Compressor

- the finest Mastering Compressor to garnish your  Masters!

The IGS AudioTubecore 3U has become an IGS studio hardware classic over the years since it's launch in 2017.

The market is quite dense when it comes to tube compressors, yet the Tubecore 3U managed to become a standard in recording, mixing and mastering studios worldwide.

 

Details

Optically appearing in a sleek black housed chassis, reminding a bit of the legendary Farichild 670 compressor, the IGS Audio Tubecore doesn't aim to be a clone:

It's an independent and individual tube compressor design.


Variable Gain-Staging

 

The well-thoughtout Gain Staging concept of the Tubecore is worth mentioning at first.

The gain-staging is realised in 3-4 steps per side/channel, depending on how you count.

First to set is the input gain (1-24db), followed by the amount of compression (0 to -12db) and finally the output gain, which can be dialed in from 1-24db also.

The fourth step is the wet/dry blender, which gives you access to more options to handle the amount of compression you want to feed in the original source.

 

Side-Chain Function

A sidechain function, which works from 60-120 hz is also included.A crucial feature in order to keep the bass from pushing the compressor too hard, sounding squashed/pumped.

6 different Attack- and Releasetimes give you the flexibility you need, in order to get a punchy and warm sound, if needed you can also aggressively make the music more dense.

In numbers: 0,1-30ms Attack and 0,1-4s Release-Time offer all of that in a musical way.

The Tubecore 3U has got wether a Dual-mono (no link) or a M/S-compression-mode built in.

The two bypass-modes are a clever feature.This way you can bypass a mode instantly, without having to switch the knob all the way down or up.





IGS-AUDIO-Tubecore half

Clever and handy feature: The IGS Audio Tubecore got 2 bypass modes for dual-mono and M/S-compression

Zwei VU-Meter im klassischen 50er-Jahre-Stil auf der Frontplatte verleihen dem Tubecore seinen edlen Look. Darüber hinaus verfügt er über zwei Bypass-Schalter und die charakteristische rubinrote Power-LED. Außerdem ist das Netzteil der Einheit ausgelagert – ein klarer Vorteil für eine gleichmäßigere, saubere und störungsfreie Stromversorgung. Was den IGS Audio Tubecore 3U wirklich einzigartig macht, ist der direkte Zugang zu den Röhren auf der Rückseite des Geräts. Dieses Feature wurde bewusst so gestaltet – mit dem Klanggeschmack und der Flexibilität des Nutzers im Sinn.

IGS-AUDIO-Tube Core back-angled

It's your turn: pick your favorite tube!Two slots on the back are free for your tube-choice.

IGS Audio Tubecore 3U
- Specifications

Device type Vari Mu Compressor Yes Basic features All stepped manipulators 24 pole Elma switches MID/SIDE Processing OpAmp M-S encode/decode Sidechain HPF 120Hz, 60Hz, Off WET/DRY Mixer 0 - 100%, 4 dB step Input & Output Input Impedance (balanced) XLR, 10k Ohm, IGS Custom Transformers Output Impedance (balanced) XLR, 600 Ohm, IGS Custom Transformers Levels Operating Level +4dBu Max input level +22 dBu Max output level +26 dBu Dynamic Range >107 dBA (@ 1kHz, +24 dBu) Max Gain Reduction 20 dB Max. gain +35dB Time constants Attack 0.1 - 30 ms Release 0.1 - 4s Bandwidth Frequency response 20Hz to 20kHz; +/- 0.2dB Distortion (@ 20 Hz - 20 kHz) Signal to Noise Ratio 95 dBA @ +4dBu, 1kHz THD 0.12 % THD+N 0.15 % IMD (SMPTE) 0.32% Crosstalk 82 dB Power Voltage 115/230V AC, 50-60Hz Power consumption 44 Wats Power supply External Packing box Dimensions 70x50x30 cm Shipping weight 9kg Others Tube set Standard: 6N1P-EW or 6N3P-EW, Optional: 6BC8, 5670, 6386

IGS Audio Tubecore 3U Mastering Compressor - Reviews

- hear,see and read what Pro's are saying abotut the IGS Audio  Tubecore 3U Vari-Mu Compressor

IGS-Audio-Tubecore3U-Review-SX-Pro

© 2026 by Falkenstein ProAudio

bottom of page