You are bidding on (1) NOS RCA 7K7 electron tube, made in the USA in 1950.  Gray plates and top mounted getter; tube will ship in the original factory tube box as shown.  Tube has been tested on a calibrated Bitmatic (Western Electric KS-15874-L2) computerized tester and is guaranteed good; test results as follows:

1513 umhos where 850 - 1700 umhos is the acceptable range on the tester

0.504 / 0.492 mA where 0.300 - 0.600 mA is the acceptable range on the tester

All our tubes are tested and guaranteed by us; we only test tubes on one of our quality calibrated mutual conductance testers, NEVER on an emissions tester.  The testers we use are Phil Frakes's Bitmatic computerized Cardmatic testers from Tubesontheweb, the specific models are Western Electric KS-15874-L2's which were made for Western Electric by Hickok; we currently own two of these testers.  Our backup testers which we use occasionally are military TV-10D/U's.  For specialized tests, we employ one of our VTV Dual Triode Characterizers (for preamp tubes) as well as a Maxi-Matcher (for power tube matching).  Tubes are guaranteed for 90 days, refund or replacement our choice. Thanks for looking at our auction and be sure to check out our other auctions for other tubes that may be of interest.  (lot ejl1001)