Classic American Sound, Taken to the Next Level
The Stam 312-5T has earned its reputation in professional recording circles as a true “Turbo API” — a modern evolution of one of the most iconic microphone preamplifier designs ever created. Inspired by the legendary A312 circuit, the 312-5T preserves the unmistakable punch, speed, and aggression that defined classic American console sound, while introducing a carefully engineered tube output stage that elevates harmonic richness, depth, and tonal character.
At its core, the 312-5T is a tube-enhanced A312-style preamplifier designed for engineers who want the authority of vintage solid-state circuitry combined with the musical coloration and dimensionality of tubes.
Hybrid Design: Precision Meets Harmonic Character
The signal path begins with a US-made 1:8 input transformer paired with our meticulously reverse-engineered 2520 discrete op-amp, faithfully recreating the components found in original 1970s API 312 cards. Every element has been carefully auditioned to capture the fast transient response, forward midrange, and unmistakable punch that made these preamps studio standards.
Following the discrete amplification stage, the signal passes through a premium ECC83 tube output stage, adding harmonic saturation, depth, and musical coloration. The tube stage feeds a custom US-manufactured 5:1 steel output transformer, built with steel laminations inspired by the classic AP2503 design, delivering enhanced low-frequency weight and a richer overall sonic footprint.
The result is a preamp that retains the immediacy and clarity of the original design while expanding its tonal palette with increased harmonic complexity and a larger, more authoritative low end.
Premium Components Without Compromise
Every 312-5T is built using carefully selected, high-grade components to ensure consistency, reliability, and sonic excellence:
US-made 1:8 input transformer
Custom US-made 5:1 steel output transformer
Reverse-engineered 2520 discrete op-amp (SA-25)
Premium ECC83 tube
1% tolerance resistors throughout the circuit
Vishay capacitors for accuracy and stability
Highly accurate 2520 DOA replica
Custom Stam aluminum knobs manufactured in the EU
All tubes are individually auditioned and selected to meet strict performance, tonal, and specification standards, ensuring optimal sound quality in every unit.
Designed for Modern Recording Engineers
While strict historical accuracy has its place, modern engineers often demand greater flexibility and expanded tonal possibilities. The 312-5T embraces this philosophy — honoring the original sonic identity while enhancing it for contemporary production workflows.
Compared to a traditional 312 design, the 312-5T offers:
Increased harmonic distortion for added character
Fuller and deeper low-frequency response
Greater tonal saturation and musical coloration
Expanded versatility across recording applications
Professional Features
Each unit includes essential studio functionality designed for real-world recording environments:
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48V Phantom Power
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Impedance Switch
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Polarity (Phase) Switch
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Integrated High-Quality DI Input
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Robust professional construction
- Gain led meter
Handcrafted in Chile
Every 312-5T is hand-built in our laboratory in Chile. This hands-on manufacturing approach allows us to individually measure, audition, and match components before assembly, ensuring consistency from unit to unit and maintaining the highest standards of craftsmanship.
By combining traditional analog techniques with modern quality control, we deliver equipment that meets the expectations of today’s professional studios while honoring the legacy of classic recording gear.
100% Satisfaction Guarantee
We stand fully behind the quality and performance of our products.
Each 312-5T includes a 30-day risk-free trial. If you don’t love your preamp, simply return it within 30 days for a full refund — no questions asked.
Jean Sebastien (verified owner) –
Very good unit, sounds great on a lot of sources. I already bought 2 and planned to buy 2 more whenever I’ll be able to
Chris Leonard –
An incredible take on a classic preamp. The tube section at the end adds a gentle saturation that really makes the mid and top range special. Love my stereo pair.
Kim –
I wanted a Pre with colour and character. Something with smooth saturation that could round off a little transient and tastefully add some grit. I ordered a pair of these and l gotta say first off they are extremely well built, and are the heaviest 500 series Pre Ive got. The specs on these tell the story. Now as for sound this Pre can go from beautiful smooth saturation to all out beast mode. Crank the gain, roll back the trim and hit it with a synth or guitar and these will never leave your rack. If saturation on a snare is your thing these can be pushed heavy without the bottom end falling apart and the top getting to brittle while gaining some serious headroom in the mix. Alternatively push the trim and roll back the gain for that API mid forward sound and let the transformers do their thing. The DI is really nice in these also, I have a Radial JDI but lately im using the 312-5T more as its doing something in the mid band I like. Line switch is perfect to patch these in on a drum bus or other line level sources in a mix to get some analog colour (this becomes addictive). I must get a pair of the 1073-5T next!
Don Davis –
The best keeps getting better. I owned the 312-5+ and “upgraded” to the 5T. Such a beautiful signature. It’s a very versatile pre that can be used on various sound sources. I love it
Joona Muistola –
I purchased one some years ago for fun and was blown away by the high end especially. I had to get another one immediately when I could afford it, to get a stereo pair. These are my go to pre’s on overheads. They somehow make the cymbals sit perfectly and when driven gently, really help to control the dynamics and harshness. These are irreplaceable for me now.
Lars –
Great unit! Sturdy build quality and in short it sounds great. As the other reviews already mention: nice API style grit/saturation and a great range of sounds. Really adds to my preamp-palette. Thanks again to the stam people for another high end unit for really reasonable price!
Ellis Forman –
Such a cool preamp! loads of color. Exactly what I’m looking for when I need something tubey and gooey. Lovely pre.
Gamaliel Rosado –
The Stam Audio 312-5T is an amazing preamp. Is my go to for bass, drums and vocals. The price was great for me too for such an amazing preamp. The costumer service from all the crew is amazing. Definitely I’m a retuning happy costumer.
Dave –
I own four of the 312-5T. I got them mainly for drums. But they sound great on many sound sources! I did compare them to WesAudio (Phoebe) which are also very good and sound very similar. The 312-5T are more vintage sounding. The WesAudio sounds more modern and a bit compressed. Turning up the gain 30% on the 312-5T gives me a great snare sound.
Stam Audio makes great gear! I have four 1073EQ+ and three 1073-5T they really sound great and the SA-4000 compressor is incredible and the gear is affordable! The only downside is waiting for the units to arrive:)
uno19music –
I own two of these units and use them for vocals mainly. Rich big sound I can’t wait to try on Drums and Percussion. Great Product!
Johannes –
I love my 312-5T! I mostly use it for a microphone in the middle of my drum kit that then gets sent through an 1176 – killer combo! I also like to plug semi-acoustic guitars or electric basses directly into it and drive the preamp, it gives the instruments a really big tone, nice low end and of course beautiful saturation. If you’re looking for a preamp that really colors in a desirable way, go check it out! I don’t think you can do any better, especially at the price point.
Terry Walton –
A little goes a long ways. I am in the middle of a project and remodeling my little studio so I finally had to sit down and try this baby out. I plugged in a Les Paul and Wow! I went from a nice defined sound to distorting it. I then tried a bass through it. It was sweet! Then I ran a snare and a kick through it. I can see why people use them for drums. Then I plugged in my SA-87T, my wife heard me singing through it and thought I was listening to Bowie. She was impredded. I was stumped at the combo. I am hoping to get a FET compressor next. II was just using the SA-87T to the312-5T to my little Apollo Twin. I didn’t use compression or EQ and it sounded like it could go on a record. It sounded like I imagined it would. The plug ins come close but they seem to be missing something sometimes. I have found that is more evident in mic pre- amps and compressors. Lower mid frequencies seem to muddy up. Not with this bad boy. Now if I get the FET compressor and a eq I can build a chain that would sound like I was in a big recording studio in Hollywood not in my basement. I will be getting at least one more. Thanks to Josh and the crew. You guys rock!
Peter –
Great sounding take on a classic pre. Addition of a tube results massive warmth/depth/color.
David Velez –
Yoooooo… this preamp ROCKS!!! I did a massive shootout with 13 different preamps on drums, some not so expensive, some way too expensive, and it was absolutely no contest… this is THE BEST preamp for Snare Top and Snare Bottom if your playing any type of heavy music. It does some kind of transient enhancement magic that is just unmatched. I can’t even understand how a preamp can enhance the transient and body of a snare without sounding woofy or tubby. If you dig that API sound but they were just a little too clean and transparent for what you’re doing, THIS IS THE PREAMP YOU’RE LOOKING FOR.
Mario Herceg –
Great Unit for Snare and Kick!! Before I use the BAE312B, but this Unit push the Snare to another World!!!