IJ Research HE-69 Equalizer

Projects > IJ Research HE-69 Equalizer

The HE-69 is Igor’s adaptation of the Helios 69 EQ for the 500-series and 51x Alliance formats. This equalizer is pulled from the legendary Helios consoles built for Island Studios, The Rolling Stones, Apple Studios, and The Who. True to the original, the HE-69 features a 10k high-shelf band, a 50hz low-cut or adjustable boost low band, and an adjustable “peak” or “through” mid band.


  • Designed for Lundahl LL1524 or LL1517 output transformers
  • Option for Lundahl LL7101 input transformer or THAT1246-based balanced input receiver
  • Two rack-unit versions can fit in a 1RU case
  • Uses Carnhill or Igor’s own inductors


  • £30 for PCB set

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