09/13/2026
Nerd 🚨 Alert! Found this neat-o project in a July 1957 issue of Audio Magazine, a single transistor phono preamp, and the wacky 1.5V+3V power supply, which is tapped(?) at ground, piqued my curiosity. Also a perfect use for a bag of vintage battery holders from the recent Antique Radio Swapmeet. After listening to a couple of different transistors, I wound up sticking with the first thing I tried, a ‘pinch top’ GE 2N107, which seems close to the suggestions in the parts list. The only departures were 1/4” jacks, an input cap, and a 10K pot in the place of the collector resistor, which makes an OK gain control. Used it for guitar and bass so far, time to experiment 🔬 a bit. Surprisingly colorful and pleasing to the ear, with loads of gain and low end, two of my favorite things 🎶