Gyraf Pultec Tube EQ PCB Set

Blank PCB set for the Gyraf Audio G-Pultec — a modernized, build-friendly take on the Pultec EQP-1A program equalizer. Boards only; no components, tubes, transformers, or hardware included.

The G-Pultec keeps the EQP-1A’s passive LC filter section and makeup gain stage, but replaces the original’s point-to-point wiring and hard-to-source parts with PCB-mounted switches and off-the-shelf components.

Design notes

• No-feedback SRPP makeup gain stage; ECC88 / 6DJ8 / 6922 recommended for lower output impedance
• PCB-mounted rotary switches — standard parts, no custom switch decks
• Additional low-frequency cut/boost positions vs. the original
• Unbalanced input, with provision for an input transformer if you want balanced I/O
• Runs on off-the-shelf power transformers

What you get: only the blank PCBs pictured. Schematics, BOM, and build documentation are published by Gyraf Audio — see the documentation tab and links below.

• Gyraf Audio G-Pultec project page
• GroupDIY forum — build threads and support

Analog Classics does not provide build support for this project. This is a tube design with lethal B+ voltages and assumes you are competent working inside high-voltage equipment.