TECHNICAL SPECIFICATIONS

• Circuit Design: Classic 312-style console topology with Discrete Op-Amp (DOA) Architecture

• Format: 500 Series (VPR Alliance & GDIY 51X compatible)

• Gain Control: 26 dB to 60 dB stepped gain via high-precision Grayhill switch

• Input Stage: 1:7 input transformer (standard kits include Link Audio LA2622; compatible with CAPI EA2622, CA2622, AVD 2622, Cinemag CMMI-8-PCA, UTM2522)

• Output Stage: Balanced 2503-style output transformer, standard wired 2:1 (standard kits include Link Audio LA2503; compatible with CAPI EA2503, AVD 2503, UTM3503, Cinemag CMOQ-2S)

• Op-Amp Compatibility: Standard 2520 DOA footprint sockets (DOA not included in kit)

• Expansion: 1x DIYRE Colour Module compatible slot

• Power Requirements: Standard ±16 V/+48 V DC (500 Series rack)

DETAILED FEATURES

• Transformer-Balanced 312 Character:

  • High-quality 1:7 input transformer (2622-style) delivers the famous 312 midrange punch and open top-end

  • 2503 output transformer (wired 2:1) adds weight and headroom

• Stepped Grayhill Gain Control: 26–60 dB continuous steps for accurate session recall

• T-Pad Output Attenuator (-∞ to +0 dB): Positioned post-preamp to let you saturate the preamp stage and transformers hard while safely backing off the output signal sent to your DAW

• DIYRE Colour Module Compatibility: Expand your sonic palette by plugging in an optional analog saturation, compression, or EQ Colour board

• Dual High-Slope Sweep Filters:

  • Low-Cut filter: 10 Hz – 250 Hz (steep 24dB/oct slope)

  • High-Cut filter: 3.5 kHz – 20 kHz (steep 24dB/oct slope)

• Complete Channel Utilities:

  • +48 V phantom power switch for condenser microphones and active DIs

  • Polarity (phase invert) switch

  • -20 dB input pad for hot line sources or loud close-mic tracking

• Visual Monitoring: Multi-segment signal level meter and Peak LED for real-time visual gain staging

• Premium Build Quality: High-grade conductive plastic potentiometers and gold-plated sockets throughout

WHAT'S INCLUDED IN THE KIT?

This is a full DIY kit including all hardware and electronics:

• Powder-coated front panel with high-quality printing

• Complete set of Link Audio transformers (LA2622 input and LA2503 output)

• Stepped Grayhill gain switch and conductive plastic potentiometers

• All electronic components, ICs, sockets, and hardware

(Note: Requires assembly and soldering skills. A Discrete Op-Amp (DOA) is NOT included in the kit so you can select your preferred model. Interactive assembly guides are available in our Build Manuals section.)