Focusrite ISA 828 (c. 2007)
Little about the Focusrite ISA 828 comes from official documentation, but period reviews fill in some of it. Mix Magazine (October 2007, p.187) introduced it as an eight-channel mic preamp and A/D converter. It is built around the same preamp circuit found in Focusrite's Forte console - the ISA 110 module, with the original Lundahl LL1538 transformer and a bespoke Zobel network. Each of the eight channels gets the same transformer-balanced topology.
The ISA 828 was positioned as both a standalone preamp and a direct front-end for Pro Tools|HD systems, thanks to its built-in A/D conversion and digital output. Later coverage in Mix Magazine (July 2012, p.33) traced the ISA line back to the original 1987 ISA 110 module, designed for Sir George Martin's Neve consoles at AIR Studios. Noise specs for the ISA family were given as -127 dB EIN (at 60 dB gain, 150 ohm source). The 828's own figures are not separately stated in the reviews.
Beyond that, the record is thin. It survives today on the used market as a heavily‑built eight‑channel preamp with genuine ISA sound.
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