(2) RCA VT-231 JAN CRC 6SN7GT Tubes - smoked glass.  Tested on my professionally-calibrated Hickok 539B tube tester.  Minimum mutual transconductance for a good 6SN7GT tube is 1640 umhos.  Transconductance values are:  3200/2900, 2200/2250.  This is obviously not a matched pair, but they are great tubes and will work fine in many applications.  Matched preamp tubes are not really necessary, unless being used in something like a differential pair phase inverter.  The typical input or gain stage preamp tube does not need to be matched between sections or channels.  Power tubes are different story.

International buyers must agree to assume risk of USPS First Class International shipping.  There is no tracking (only customs number) and if it gets lost, I cannot help.  If you do not agree to assuming the risk, I will insist on Priority Mail shipping.