GSM290 Quad Balanced Output card

This is a drop-in replacement for the EV11290 Quad Balanced Output card as used in Neve VR consoles. The original Neve card has been thoroughly assessed by Graham, and a new design in the form of the GSM290 has been created to improve on the original product. Particular attention has been paid to common-mode performance: a combination of design analysis, tight-tolerance components and careful PCB layout (using 4 layers) have yielded a card where the 4 sections have identical performance. The card can be used in any application where a high-quality balanced output driver is required. An application note is available on request.