All the pre-amplifier that you'll ever need. After this build, there will be nothing else to upgrade to in terms of pure performance. Extra features can be plugged in using external boards, This project features a high-performance pure class A discrete transistors design engineered specifically for those who demand absolute sonic transparency and textbook-perfect engineering.

Ultra low distortion high slew rate high bandwidth preamplifier. Faster and lower THD than any op amp, both chip or discrete. Single or dual power supply.

Measurements:

Total Harmonic Distortion 1k: 0.000003%

20k: 0.00006%

Slew rate: Over 200V/Microseconds

Bandwidth: 10hz - 4 Megahertz flat.

Supply Voltage: Single Supply 20V - 100V

Dual Supply +-12V - +-50V

For best results, use quality parts and match transistors that are in pairs facing each other. Instructions are in the PCB silkscreen thus read them first before purchasing parts so that you can know which parts to purchase based on your power supply type.