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6CG7 is NOT a drop-in replacement for 12AU7

The heater connection for 6.3V operation is different. In the 6CG7/6FQ7 there is 6.3V across pin 4 to pin 5 and no connection or ground on pin 9. For 12AU7 operating on 6.3V, pins 4 and 5 are connected together, with 6.3V between them and pin 9.

For 12V operation of the 12AU7 a 12FQ7 may be a drop-in.


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  • 6CG7 is NOT a drop-in replacement for 12AU7 - JJ Triode 19:35:08 07/11/15 (1)

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