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Questions about tubes and gear that glows. FAQ

12FQ7

Have used some Japanese made, Raytheon labeled 12FQ7. Very nice tubes. IIRC, the heater line would need slight change (pin 9?) --- to use the 12FQ7 in a circuit designed for the 12AU7 (parallel pins 4&5 and 9).


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  • 12FQ7 - FenderLover 16:22:41 03/22/16 (1)

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