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