2 layers300 × 90 mm

Preamp
profdc9/PrettyGoodPreamplifier
A Pretty Good Preamplifier for Stereo and Subwoofer Use
222 parts10
Boards in 2 GitHub repositories, designed in KiCad, that use the INA134UA by Texas Instruments (-40℃~+85℃ 1 100uV 2uV/℃ Built-in current limiting / output protection ±18V SOIC-8 Special Purpose Amplifiers ROHS). See how each wires it, with its parts, size, README and files; the INA134UA’s symbol, footprint and pinout are on its own page.