Up for sale is a single piece (1 PC) of vintage NOS RCA 6SN7GTB dual triode vacuum tube, packaged in a white box. Manufactured in the USA, this classic vintage audio tube features iconic red print branding, a space-saving coin base design, high-grade black plates, and a top ring getter assembly. Renowned for its warm musical balance, tight controlled bass, clear midrange reproduction, and dependable longevity in audiophile preamplifiers, driver stages, and Hi-Fi tube equipment.

As shown, the tube has been thoroughly tested on an advanced Amplitrex AT1000 tube testing system in full fixed-bias mode, testing balanced across both triode sections. Plate current (Ip) and mutual conductance (Gm) measurements alongside percentage performance ratings relative to nominal factory specs are detailed in the table below.