A friend of mine designed a simple phono preamp for me to use with my newly purchased turntable. Once he was done with the design, I used EAGLE to design PCB layouts for both the power supply and amplifier boards. They were fabricated by OSH Park.

The power supply outputs 27V and uses a LM317LZ regulator. The amp section uses 2N5088 transistors.

The build was relatively unremarkable. I used an aluminum Hammond chassis, and point-to-point wired everything before, between, and after the PCBs.

It sounds great and has been trouble-free for years!