Up for sale is a matched pair (2 Pcs) of vintage NOS 6SN7GT dual triode audio tubes, complete in their original Haltron boxes. Manufactured in Russia with branding and printing executed by Haltron, these valves feature grey plates, clear glass envelopes, and plate getters. Celebrated for their stable electrical properties, strong drive capability, and transparent sonic presentation in Hi-Fi preamplifiers, driver circuits, and line stages.

As shown, both tubes have been thoroughly tested on an Amplitrex AT1000 digital tube tester. Plate current ($Ip$) and transconductance ($uMhos$) measurements alongside percentage performance ratings relative to nominal factory specs are detailed in the table below.