Two, NEW in box, Dumont branded- Sylvania manufactured 6SN7GTB tubes. These tubes are branded Dumont, who by this time in history, in the late 1960's, was no longer a television manufacturer- but only an empty name who distributed rebranded tubes made by other manufacturers. These tubes were manufactured by Sylvania, as evidenced by inspection, as well as the presence of the "312" manufacturers code on the base- which uniquely identifies Sylvania as the original manufacturer. Red printed logo bases, black, angled T-plates, chrome dome silvering. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure- test at 3375-3250 and 3250-3187 where pass/fail is 1625 micromho.  They have the same structure inside and out, having date codes of "69-34" and "69-02", the 34th and 2nd week of 1969 for the rebranding- the original Sylvania date codes, "AKX" and "AKL", manufactured in mid 1964. 

Many other lots of tubes for sale this week.

Shipping is free within the continental US. Elsewhere- exact postage only, no packing feee