6201

Premium ruggedized miniature 9-pin high-transconductance dual triode constructed with heavy-duty filaments and anti-shock mica spacers for high-reliability military and aircraft communications. Equivalents: 12AT7, 12AT7WA, 12AT7WC, ECC81, CV4024. Real-Life Examples: Military avionics communication frames, naval shipboard tracking radio receivers, high-end vintage high-fidelity tuners.