Lang 312L: New York-Style Preamp Tone in a 500 Series Module

The Heritage Audio Lang 312L is a 500 Series microphone preamp, delivering up to 90 dB of gain from a single-slot module. A microphone preamplifier boosts the quiet signal from a mic up to a usable level, and the tone it adds along the way shapes the character of every recording. The 312L is voiced for the punchy, forward New York sound that made classic discrete preamps famous on drums and rock vocals. Slotting into any compatible 500 Series rack, it brings that energy to your recordings without taking up a full rack space.

Up To 90 dB of Clean, Fast Gain

With as much as 90 dB of gain on tap, the 312L drives even the most demanding microphones with room to spare. That headroom matters most with ribbon and vintage dynamic mics, which put out very low signal and often leave other preamps straining. Extremely low internal noise, rated below -130 dBu EIN, keeps that gain clean so you hear detail instead of hiss. The result is a fast, present sound that reveals dynamics you might not have known were in the performance.

Class-A Discrete Op-Amp Core

At the heart of the 312L sits Heritage Audio's custom HA-880 discrete op-amp, the gain stage responsible for the preamp's muscular character. A discrete op-amp builds its amplifier from individual transistors rather than a single chip, a design prized for its punch and three-dimensional depth. The HA-880 is footprint-compatible with other classic op-amps, so you can swap it out to fine-tune the tone if you like. That mix of stock character and easy customization keeps the 312L flexible as your sound evolves.

Custom Lang and CineMag Transformers

Transformer-balanced inputs and outputs give the 312L its thick, solid low end and smooth top. A transformer is a wound component that both balances the signal and adds subtle harmonic weight as audio passes through it. The 312L pairs custom-made Lang and CineMag transformers on the input and output to produce a professional, broadcast-ready signal. This is the same transformer-coupled recipe that gives high-end preamps their sense of size and authority.

Built-In Impedance Lifter for Ribbon Mics

A dedicated lifter switch raises the microphone input impedance for a bigger, more open sound with certain mics. Input impedance is how much the preamp loads down a microphone, and the right value can dramatically change a mic's tone and output. Engaging the lifter shifts the input from 1200 ohms to 10 kohms, which is ideal for low-gain ribbon microphones that need a light load. It is a rare feature at this level and one that ribbon and vintage-mic users will reach for constantly.

Mic, Line, and DI Inputs in One Slot

The 312L is more than a mic pre, handling three source types from its front-panel connectors. A versatile combo jack accepts both XLR microphone cables and 1/4-inch TS connections, while a high-impedance DI input welcomes instruments directly. That DI is genuinely high-impedance at greater than 2 megohms, so a passive guitar or bass keeps its full tone without being loaded down. One module therefore covers mics, line-level sources, and instruments alike.

Phantom Power, Pad, and Polarity Controls

Practical switching rounds out the front panel so the 312L fits real sessions. Switchable +48V phantom power feeds condenser microphones, while a -20 dB pad tames hot sources before they overload the input. A polarity switch flips the signal to help you line up multi-mic setups, such as the top and bottom of a snare. These controls make the preamp as easy to place on a session as it is characterful.

Great on Drums, Bass, Vocals, and Guitars

The 312L truly shines wherever a track needs to cut through a busy mix. Its fast, crunchy, present character flatters kick and snare, adds aggression to bass, and pushes rock and pop vocals forward. Because it delivers so much clean gain, it also excels as a color preamp when you want to drive its transformers for extra grit. From tracking a full drum kit to warming up a DI bass, one module earns its slot quickly.

A 500 Series Preamp That Punches Above Its Slot

For engineers building a modular rack, the 312L packs remarkable capability into a single 500 Series space. It runs on the standard plus-and-minus 16 V DC rails supplied by any compatible 500 Series rack, drawing about 50 mA per rail. With up to 90 dB of gain, custom transformers, a swappable discrete op-amp, and an impedance lifter, it covers ground that usually takes several units. That density makes it a cornerstone module for both new and seasoned rigs.