Up for sale is a premium single (1 Pc) vintage NOS Sylvania 5751WA ruggedized military-spec high-mu dual triode audio tube, packed in a white box. Manufactured in the USA, this highly sought-after military valve features heavy-duty black plate construction paired with a iconic top square getter. Highly prized in audiophile circles for its exceptional mechanical stability, ultra-low microphonics, detailed resolution, and sweet, natural tonal balance in 12AX7 amplifier positions.

This tube has been 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 specs are detailed in the table below.