IGS – One LA 500
Demo unit available

Series 500 Compressor LA2a Style - special price through summer 2018


  • 500-series double module, mono unit
  • +4dB operating level
  • Original Teletronix ’68 audio path
  • tubes powered by 250V DC
  • JJ 12AX7 input and RFT NOS 12AU7 output tubes
  • Sowter input transformer
  • Edcor output transformer
  • OEP sidechain transformer
  • T4B replaceable photocell (for special order)
  • Power consumption: max 180mA per slot
  • Input impedance: 10k Ohm
  • Maximum output: +21dBU
  • Amplification: 36dB
  • Gain reduction: 36dB
  • Frequency response: 20Hz – 20kHz, +/-0.1 dB
  • Potentiometer manipulators
  • Hard wire bypass
  • Compressor/Limiter mode
  • Large VU meter

€ 725,-
Price excl. VAT
excl. shipping

The IGS ONE LA is an opto-compressor built for the 500 series format. This is the first high voltage vacuum tube 500 series module that is offered by IGS.  It is powered with 250V DC from an on-board voltage converter, so it can be plugged into any 500 series rack equipped with a standard power supply.

Every single ONE LA is hand made with high quality, matched components (1% metal film resistors, Wima caps). It is equipped with RFT NOS tubes and individually calibrated to give you the unique and unspoiled experience of one of the best opto-compressors in the history – the Teletronix ’68 LA-2A. We have spent hundreds of hours designing the ONE LA, to make sure that it is as simple to use as it is versatile. Not only for harmonically rich vocals and strings, but also for huge and beefy drums and bass instruments. Three audio transformers (Sowter and Edcor in audio path and OEP in sidechain) have been used to provide excellent performance and with only two knobs and a single compressor/limiter switch, there is nothing that could go wrong.


Front Panel

VU Meter
Limiter/Compressor mode
Gain – Output level
Peak Reduction

dB says

So wie did the obvious test and A/B’d the IGS One LA 500 with it’s famous original, the Teletronix LA2a.
And indeed, the IGS performs remarkably well.
Generally speaking I’d say that it adds less colour, particularly when doing a lot of gain reduction.
Remember that the original will change the frequency response considerably when compressing a lot, up to the point where it’ll eat up all the top end.
The IGS version won’t change the frequency response that much and therefor I can think of a number of applications where I would recommend it over the original LA2a.

Also it seems the IGS seems easier to set.
With the real thing you never know why / how / when the needle will junp to some 10-12db gain reduction and swallow a whole word or two. It’s always been a bit of a wild horse.
You will find this phenomenon to be much less apparent with the IGS, it seems to be more apt to doing what it should be doing.

On the downside one might argue that the IGS lacks a bit of the magic sheen of the original.

Let me put it this way:
Matter of fact I wouldn’t wanna miss either these days.
By now I’ve indeed kinda figured out when I will turn to the one or other.
They both have their pro’s and con’s without a doubt.
I’d call this a 50/50.