Two, Sylvania JAN CHS 6SN7W tubes, military issue. Green printed logo bases, black, T-plates, reinforcing rod, chrome dome silvering, TALL bottle. These are very rare, only made in January and February of 1945. Excellent sonics. The 6SN7W is a ruggedized version of the 6SN7GT and can be used in applications calling for the 6SN7GT. 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 3125-3062 and 3000-3000 where pass/fail is 1625 micromho. They have the same structure inside and out, having matching, etched, date codes (found at the top of the bulb) of "B5", manufactured in the last two weeks of January 1945, wartime manufacture.  

Many other lots of tubes for sale this week.

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