12au7 Preamp Schematic. Output impedance can be reduced to 625 ohms and a higher output current is needed. If you need less gain take a look at the RCA 12AU7 ECC82 Cathode Follower Tube Preamp Schematic which has a gain of about 8.
12AU7 Tube Preamplifier Schematic by Tim William. The scheme comes from the process of scanning old HiFi schematic books. There is a simple plan to change space.
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This is a high gain preamplifier that is suitable for use where a lot of gain is required - to drive a power amplifier that needs plenty of gain or perhaps for use with instruments like a guitar or microphone. I used 12AU7 tubes and a B voltage of about 150V. With 12AU7 the plate resistance 72k tube gain 17. Therefore I am aware of the plan.
