FREE US SHIPPING!!: You are bidding on (1) NOS Cetron 3B22 electron tube, made in the USA in 1988.  Tubes come from sealed cases, all have identical date codes.  Tubes and boxes are in pristine condition.  Tubes ship in original boxes as shown. 

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 tester we use is a computerized cardmatic tester from Tubesontheweb dot com; the specific model is a Western Electric KS-15874-L2 which was made for Western Electric by Hickok.  Our backup tester which we use occasionally is a military TV-10D/U.  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 V3-3B22)