SA-3A+

Dual Channel Opto Compressor

Next Batch:November 2025

(1 customer review)

Original price was: $1,990.00.Current price is: $1,790.00.


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Solid State Opto Compressor

The Stam Audio SA-3A+ is the only 1:1 sounding replica in the world of the beloved UREI LA-3A and UREI LA-4. Being the LA-3A the all time favorito electric guitar compressor and the LA-4 one of the greatest acoustic guitar comps in the planet it made sense to build both of them into a single unit.

Using custom wound US-made transformers, the absolute best T4B in the market made by Kenetek Pro Audio in Kentucky and a UK made Carnhill output transformer we can confidently say this is not only the most accurate sounding vintage LA-3A and LA-4 replica in the market but also the most versatile at any price point you will ever find.

Kennetek’s Super Stereo Matched T4B

Being the single most important part on a LA-2A and LA-3A and having tested every single T4B under the sun (including our own!!) we always come back to Bill Jones’s US hand-made T4B’s. It is simply identical to an original T4B from the 70’s and every SA-3A+ comes with a matched pair of them that exceed any matching out there. They are so meticously matched that you could even mix a stereo track though them. Without this component there is no accurate LA-3A replica. The SA-3A Plus also includes a Opto element found in the LA-4 which produces a more transparent compression.

The Iron

Since both circuits shared the same transformers it was a no brainer to go the extra mile and give you two iconic compressors for the price of one by including the revered LA-4 compressor into the same unit. The LA-4 is famously known for its cleaner sound and an all time favorite acoustic guitar compressor. Each unit comes with precise replicas of the original transformers giving you the exact same character and frequency response as and old LA-3A.

Hand made with added features

Each SA-3A+ is hand built at our lab in Chile one by one with the highest quality components available. No shortcuts have been taken to ensure you can use them interchangeably with an old LA-3A or LA-4. The SA-3A+ now comes with a stereo link switch that allows you to use two of them in stereo, a high and low gain setting, a flat and high frequency compression selector, a bypass switch and a limit/comp selector which also acts as a ratio switch on the LA-4 circuit changing the ratio from 4:1 (comp) to 8:1 (limit).

The ultimate cure for “digititis”

While plugins have come a long way and are incredibly useful, there’s a reason the top engineers still have analog gear in their racks. And some of the biggest gains to be made if you’re mixing “in the box” is to use quality hardware on your tracks.

Legendary on vocals, magic on bass and a must have for electric and acoustic guitars the LA-3A and LA-4 are one of those rare pieces that just make things sound better.

100% satisfaction guarantee – if you don’t love your SA-3A+ we’ll refund you

If you’ve worked on a classic UREI LA-3A before, we’re extremely confident the SA-3A+ will put a big smile on your face every time you use it. However, if you’ve never touched either of the originals before, as gear lovers ourselves, we understand that the only way to really know if this compressor is for you, is to put it through its paces. That’s why all Stam Audio units come with a 30 day money back guarantee. This allows you to get it into your rack and see how it impacts your recordings. If you love it (and we think you will!), great…keep the unit and create amazing music with it. If not, no problems. Just send it back to us and we’ll fully refund your purchase

Technical Specs

  • LA-3A and LA-4 in one unit (original schematic)
  • Kenetek US made T4B optical cell
  • Custom US made input transformer
  • Custom US made autoformer
  • Carnhill UK made output transformer
  • LA-4 Vactrol Compressor
  • High and Low gain
  • Stereo Link for both compressors
  • Limit and Comp switch (switches ratio 4:1 to 8:1 on LA-4)
  • HF and Flat switch for both compressors
  • Period correct knobs
  • Bypass switch
  • Vishay capacitors
  • Hand made in Chile
  • 2-year warranty
  • 30-day money back guarantee

1 review for SA-3A+

  1. Jeremiah Bligen

    I have taken many swings at adding the 3A sound to my setup over the years, trying plugins and multiple hardware units (most of the usual subjects, minus the UREI) – Stam’s my favorite by a mile. I was lucky enough to have an SA-23A+ for a while, and fell in love with the 3A on my lead vocal and moved to the single channel, 500 series SA-3A5 as I was using the 3A pretty much exclusively as the opto in my chain. Once I moved away from the 500 series format to all rack, I jumped on the SA-3A+ after seeing that they were made available again. It arrived in Stam fashion, throughly packed, and immaculately built. Sounds incredible and now I have additional functionality to use for bus work in addition to tracking, with the bonus of the LA4, 5 stars!

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