This project is an alternative version of my 325 EQP-1A Make-up Gain project from 2024.

The big way this layout differs from the 2024 board is that it has pin headers that you can use to hook it up in an inverting configuration, along with pin headers for various primary and secondary strapping options of the output transformer. 

Attached .pdf doc contains schematics, partial BOM, and a lot of random references to other similar line amp stages that you can use for reference when determining your configuration and component value choices. The BOM included with this one is vvvvvery bare bones and not as straightforward as the 2024 version.

...and as explicitly stated: this is an open-source project for D.I.Y. purposes only, not for resale and not for profit.