Up for sale is a single vintage NOS Ken-Rad VT231 / JAN 6SN7GT military-grade dual triode audio tube, complete in a clean white box. Made in the USA, this highly coveted military valve features signature black plate construction, a bottom leaf getter structure, and a smooth black base. Legendary among audiophiles for its rich bass extension, wide soundstage, and authoritative tone in preamp and driver stages.

This tube has been thoroughly tested on an Amplitrex AT1000 automated valve tester at nominal reference settings. Plate Current (Ip) and Transconductance (uMhos) measurements alongside percentage performance ratings relative to standard factory specifications are detailed in the table below.