You are bidding on (1) NOS Bendix 6AU6 electron tube, made in the USA in 1956; date code of 56-39 indicates 39th week of 1956.  Gray plates, copper rods, dual mica spacers, and top mounted getter.  Very nice quality 6AU6 tube that can be used anywhere a 6AU6 is called for.  Original box is in good condition.  Stock up now for your gear.  We have literally hundreds of thousands of tubes in our warehouse, so please continue to check our listings as we will be listing more electron tubes each week.  Tube has been tested on one of our calibrated Bitmatic (Western Electric KS-15874-L2) computerized testers and is guaranteed good; test results as follows:

5292 umhos where 3150 - 6300 umhos is the acceptable range for 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 ewa1001)