Wiring circuit

The following chart is a simple two-line preamp with 12AU7 / ECC82 tube. The overall gain of the schema is about 8 , The second phase of the schema is a cathode followers and a low impedance amplifier. This schema is from the RCA tube manual.


The schema is simple and requires no special components. For the power supply, you can create a Hammond 370BX transformer with simple CLC or CRC filtering to B +. You want to use a good quality capacitor C4 for the best results.