Up for sale is a tightly matched pair (2 Pcs) of vintage NOS Sylvania JAN-6SL7WGT ruggedized military-spec high-mu dual triode audio tubes, packed in white boxes. Manufactured in the USA, these sought-after military valves feature black plate construction, a distinct top square getter, and a durable low-loss brown micanol base. Celebrated by audiophiles for their exceptional mechanical ruggedness, ultra-low microphonics, outstanding imaging, and extended high-frequency clarity in driver and preamp stages.

Both tubes have 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.