• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

One Half 12AU7

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The 7 pin mini 6C4 contains a single triode that's electrically equivalent to the pair in a 12AU7. So, that's an obvious possibility. Another option is to use 2X 12AU7s, with only a single section energized. Wire Channel "A" to use system 1 and Channel "B" to use system 2.
 
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