Up for sale is a single piece (1 PC) of highly prized vintage Brimar 6SN7GT dual triode vacuum tube, packed in a white box. This classic early-production tube features black plates, a bottom square getter, and a smooth black base. Renowned in high-end audio circles for its lush British tonality, extraordinary midrange warmth, dynamic impact, and exceptionally low noise floor in Hi-Fi preamplifiers and driver stages.

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