Two, new in box, Sylvania 2A3 tubes. Green printed logo bases, black plates, support rod, fishing pole filament support springs. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm bases, excellent silvering. Tubes are matched for structure and dynamic gain- test at 3600, 3500 where pass/fail is 1900 micromho. The tubes have the same structure inside and out, having date codes of "2N" and "2ZR", July and December 1942. 

Many other lots of tubes for sale this week.

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