Up for sale is a rare single (1 Pc) vintage NOS Siemens ECC88 / 6DJ8 dual triode audio tube, complete in its original manufacturer box. Made in Germany, this early production valve features distinctive black plate construction and a top ring getter design. Celebrated by audiophiles for its exceptionally low noise floor, high transparency, dynamic bass punch, and extended top-end detail in high-end preamplifiers, DAC buffer stages, and headphone amplifiers.

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.