You are bidding on (1) NOS Chatham Electronics JAN-CAHG 6D4 electron tube, made in the USA in 1956.  High quality 6D4 electron tubes made under contract for the US Military back in the 1950's; these will work in any gear requiring a 6D4 electron tube.  Black plates, white silkscreen, dual mica spacers, and top mounted getter.  Tubes ship in the original boxes as shown; boxes are fair to good.  Tubes have been tested on a calibrated Bitmatic (Western Electric KS-15874-L2) computerized tester and are guaranteed good.

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 eem1001)