TL;DR - It doesn't get much better than eight Rupert Neve-designed ISA preamps, with Lundahl transformers on every channel, variable impedance, and 80 dB of gain for those ribbon mics. Eight channels of elite tracking front end for drums, bands, tape, and high-end digital recording.

For sale is a Focusrite ISA 828, one of the finest 8-channel microphone preamps ever produced. Based on Rupert Neve's legendary ISA 110 design for AIR Studios, the ISA series delivers the classic transformer-based British sound with enormous headroom, exceptional detail, and the flexibility to handle virtually any source.

Each of the eight channels features a premium Lundahl LL1538 input transformer, providing the depth, transient response, and musical character that have made the ISA series a studio staple for decades. Unlike many modern "clean" preamps, the ISA 828 combines transparency with a subtle transformer richness that flatters vocals, drums, guitars, bass, acoustic instruments, and full-band tracking.

Features include:

• 8 independent ISA mic preamps
• Lundahl LL1538 input transformers on every channel
• Up to 80 dB of gain
• Variable input impedance (including the original ISA 110 setting)
• Front-panel instrument DI inputs with selectable impedance (Z-In)
• Switchable high-pass filters
• Insert points on every channel
• Exceptional headroom and low-noise performance
• Ideal front end for tape machines, high-end converters, and hybrid analog studios

One of the ISA's most unique features is the variable impedance section, allowing you to optimize the interaction between the preamp and different microphones. Ribbon mics, vintage dynamics, condensers, and modern moving-coil microphones can all benefit from impedance matching, making this a far more versatile tool than typical preamps.

The front-panel Z-In instrument inputs are equally impressive, offering selectable impedance settings that let you tailor the response of guitars, basses, keyboards, and pickups in a way that most DI boxes simply cannot.

Whether you're tracking a full drum kit, recording a band live, feeding a tape machine, or looking for a world-class front end for your converters, the ISA 828 remains one of the best values in high-end professional audio.

*Please note the 3rd line in/DI jack in the first photo. The jack mechanically works but has been lost inside the unit. Easy fix if needed, I've never needed 3 DIs through the focusrite at once.