Up for sale is a single piece (1 PC) of highly sought-after vintage Brimar 6SN7GT dual triode vacuum tube, packed in a white box. Manufactured in England, this classic vintage tube features black plates, a bottom square getter, and a smooth black base. Renowned among audiophiles for its rich British voice, outstanding tonal accuracy, extended dynamic range, and exceptional performance in high-end 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.