This is an Ultra Simple Symetrical Pre Amplifier. There are 2 versions:

1. USSPA1: uses audio mosfet driver as output.
2. USSPA2: uses audio Sanken bjt as output.

Gain can be set from 0 to about 15db.

Tonal balance, soundstage and dynamic are its characteristics.

PCB are available upon request. At this moment the pcb color is black.

See these links:

https://www.diyaudio.com/forums/analog-line-level/339659-usspa-build-thread-post5837348.html