The 6AB8/ECL80 is a Dual Triode vacuum tube typically used in radio-frequency (RF) preamplifier stages and in high-performance audio equipment. It is a nine-pin miniature glass tube with a low plate resistance and high transconductance, making it well-suited for wide-bandwidth applications. Its symmetrical structure allows for use in push-pull output stages and its dual triode design simplifies circuit design. The 6AB8/ECL80's superior signal-handling capabilities make it an excellent choice for high-end preamplifiers and power amplifiers.