6189

High-reliability miniature 9-pin medium-mu twin triode featuring a heavy-duty heater and reinforced mica construction to ensure reliable operation in applications subjected to frequent cycling. Equivalents: 12AU7, 12AU7A, ECC82, 5814A, 12AU7WA, CV4003. Real-Life Examples: Commercial aircraft communications panels, laboratory-grade testing gear, vintage high-fidelity audio preamplifiers.