Teletronix LA-2A by Universal Audio

Thank you for purchasing this reproduction of the Teletronix LA-2A. The LA-2A was originally produced in the early 1960s by Teletronix, which was later acquired by Babcock Electronics Corporation. My father purchased the product rights and the name Teletronix from Babcock Engineering in 1967, folding it into his Studio Electronics Corporation, shortly before he changed the name to UREI. There were three different variations of the LA-2A during this period before production was discontinued around 1969.

Straightforward in its design, and initially intended for broadcast applications, the LA-2A quickly became standard equipment in studios worldwide. Many have been painstakingly maintained for the 30 years that they have remained in use since production stopped. A tube-based compressor, the LA-2A features hand-wired components and two simple controls. At the time, its electro-luminescent optical gain reduction was quite revolutionary: applying the audio signal to an electro-luminescent light panel which shines on a photo- electric cell which in turn controls the gain. In contrast to the electro-optical devices which preceded it, the electro-luminescent light source provided the fast attack necessary for broadcast applications. Additionally, the cadmium-sulfide photo-cells provided a very natural “two-stage” release which resulted in a compression characteristic more transparent than the other compressors of its day. To this day the LA-2A delivers a trademark sound treasured by engineers worldwide.

Here at Universal Audio, we have gone to great lengths to recreate the LA-2A with complete authenticity. It’s been no small feat to locate obscure parts, put quality control programs in place that didn’t exist 30 years ago and find personnel capable of the handwork that goes into each unit. Every step was necessary to ensure that each LA-2A delivers the sound you expect.

As for the future, we are working on additional reproductions beyond the LA-2A and 1176LN. To that end, we are interested in your opinions about your favorite pieces of vintage gear. What can’t you live without? What would you love to own, but can’t find any longer? In addition, Universal Audio is working on new products designed to meet the demands of the modern digital recording studio, yet retaining the character of classic vintage equipment.

Developing these products has been quite an adventure, enjoyed by all involved. We thank you for your support and we thank my father, Bill Putnam.

Thank you,

Bill Putnam

LA-2A specifications

The Inova LA-2A is a sophisticated optical compressor renowned for its classic design and exceptional sound quality. Hailing from the lineage of legendary optical compressors, the LA-2A combines vintage warmth with modern reliability, making it a staple in professional recording studios globally.

One of the main features of the LA-2A is its opto-electronic gain reduction circuit, which utilizes a light-dependent resistor (LDR) and a sealed optical element to achieve compression. This unique mechanism provides a smooth and transparent compression, allowing the audio signal to maintain its natural dynamics while controlling peaks effectively. The optical design contributes to a musical response, widely regarded as one of its defining characteristics.

The LA-2A also features a simple and intuitive interface. It includes essential controls such as Peak Reduction, which adjusts the level of gain reduction, and Make-Up Gain, which compensates for any lost level after compression. The device typically has two modes: the Compress mode for moderate compression and the Limit mode for more aggressive limiting. This flexibility makes it suitable for a variety of audio sources, from vocals to instruments.

Another noteworthy characteristic is its true tube circuitry. The LA-2A employs a vacuum tube in its audio path, contributing to its warm tonal character. This tube coloration enhances the richness of audio signals, making the device particularly popular for vocals and bass, where presence and depth are paramount.

Additionally, the build quality of the LA-2A is exceptional. The chassis is constructed from durable materials, ensuring longevity and reliability in demanding studio environments. Its vintage aesthetic features analog VU meters, adding to its charm while providing visual feedback of the gain reduction.

Inova has modernized the LA-2A with contemporary features while preserving its classic sound. Enhanced technologies such as improved signal-to-noise ratio and updated component designs ensure that the LA-2A remains competitive in today's digital landscape.

Ultimately, the Inova LA-2A is a beautifully crafted compressor that delivers a unique sonic signature. It combines vintage appeal with modern functionality, making it an essential tool for audio engineers and music producers seeking to achieve professional-grade mixes. Its smooth compression characteristics, intuitive controls, and durable design are testaments to its lasting legacy in the world of audio processing.