IGS Audio 825EQ – Stereo Tube Mastering Equalizer in EAR 825 Tradition
 
Bring the legendary EAR 825 tone into your own studio with the IGS Audio 825EQ – a modern stereo tube mastering equalizer inspired by Tim de Paravicini’s classic design, yet engineered for today’s workflows.

Instead of chasing overpriced vintage units, you get that unmistakable tube EQ character in a reliable, accessible package for everyday mixing and mastering.
 
Modern take on a legendary tube EQ
 
The 825EQ is a dual mono tube equalizer housed in a 3U 19" rack chassis, following the philosophy of the iconic EAR 825 while adding contemporary precision and flexibility.
A fully tube‑based signal path combined with UTM transformer‑balanced inputs and outputs delivers the kind of analog warmth, depth and stereo width you expect from a true high‑end mastering EQ.
With five EQ bands in EAR 825 style, the 825EQ lets you shape lows, mids and highs in a musical and highly transparent way – from subtle mastering moves to more pronounced colour on buses and stems.
 
ELMA stepped controls – recallable precision
 
All controls on the IGS Audio 825EQ are stepped ELMA switches, giving you precise, repeatable settings for serious mastering work and fast recalls between projects.

Each band offers boost/cut ranges of either +/- 6 dB or +/- 12 dB, so you can choose between a fine‑tuning mastering version or a more surgical, creative option depending on your workflow.
Hardwire bypass per channel lets you instantly compare processed and unprocessed signal, making it easy to judge exactly what the EQ is doing in the chain.
 
Tube architecture and transformer design
 
Inside, the IGS Audio 825EQ is all about tube magic and transformer detail: three ECC88 tubes per channel are standard, with the option to swap in 6N23P or 6N1P valves if you want to fine‑tune the tone from smooth and vintage to more open and hi‑fi.
Three audio transformers per channel, combined with UTM transformer‑balanced I/O, keep the signal clean, punchy and dimensionally rich – even at higher boost settings.
A robust linear power supply / external PSU ensures stable, low‑noise operation, so the equalizer stays quiet and controlled even when pushed.
 
For mixing, mastering and high‑end recording chains
 
Whether you’re treating a full mix, enhancing a stereo bus or adding air and weight to a vocal chain, the 825EQ behaves like a true mastering equalizer: smooth top end, solid low end and a midrange that stays musical instead of harsh.

From acoustic, jazz and pop productions to modern electronic and hybrid scores, this stereo tube EQ adds the polished analog finish many engineers miss in the digital domain.
 
Thanks to its dual mono architecture, it also shines on stems and parallel buses, letting you apply different settings on left and right or on independent channels when needed.
 
Key features
 
Stereo tube mastering equalizer in legendary EAR 825 style
Dual mono tube design with three tubes per channel (ECC88 standard, 6N23P / 6N1P compatible)
5‑band equalizer with musical curves for mixing and mastering
All‑ELMA stepped controls for precision and perfect recall
Two versions available: +/- 6 dB or +/- 12 dB boost/cut per band
UTM transformer‑balanced inputs and outputs, three audio transformers per channel
Hardwire bypass per channel for instant A/B comparison
Linear / external power supply for clean, low‑noise performance
 
If you are looking for a stereo tube EQ that combines EAR 825‑style musicality with modern mastering‑grade control, the IGS Audio 825EQ is a serious candidate for the centre of your analog chain.