Two, RCA VT-231, JAN-CRC-6SN7GT tubes, wartime manufacture, military issue. Silver printed logo bases, black, flat plates, smoked glass. Outstanding sonics. Tested on a Hickok TV-3 military tester that has been calibrated. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure- test at 3250-3250 and 3250-3125 where pass/fail is 1625 micromho. They have the same structure inside and out, having date codes of "H3E" and "H1E", May-June 1944 and Janur...ay-February 1944. There are no emissions deposits on the top glass, these are either new or very, very lightly used.Many other lots of tubes for sale this week.Shipping is free within the continental US. Elsewhere- exact postage only, no packing feee