The EQP500 is a Pultec-style passive equalizer for the 500 series. It employs the same filter network as the Pultec PEQ1a, but instead of using tubes for makeup gain it employs a discreet opamp. The creator is planning on offering a partial kit for this project in the near future.

Images courtesy of IOAudio

Notable Features:

• PEQ1A filter network
• Nickel-iron core inductor
• Input and output transformers based on the Triad HS-56
• Discreet Opamp socket accepts endless options from API, John Hardy, etc.

Price: Not announced yet.

More info: Keep an eye on IOAudio’s original thread to see when kits are offered.