You are bidding on a (1) MULLARD 12AU7/ECC82 Electron Tube, LONG PLATES - SQUARE GETTER. Made in 1957 at the Blackburn plant in England. The codes are K61/B7E - 1. 5. 7. Tested New. Date code is N/A, if you need further information please E-MAIL. I will try to answer your questions, I used a Heathkit TC-3 tube tester. FREE SHIPPING CHARGES!