Vacuum Tube - 6AV6 / EBC91, Dual Diode, Triode
New-Old-Stock (NOS) tube.
The 6AV6 is a miniature duplex-diode, high-mu triode intended primarily for use as a combined detector, amplifier, and automatic-volume-control tube in radio receivers. The triode section incorporates a high amplification factor and is capable of providing a relatively large undistorted output voltage from a very small input signal.
The 3AV6, 6AV6, and 12AV6 are alike except for heater ratings and heater-cathode voltage ratings.