This auction is for (2) RCA NOS, NIB CRC 6SH7 RF/IF Tubes, (Matching Pair)  TV-7D/U (Digital Meter) Tested, #1- 71.2,  #2- 71.88 Minimum 43.0 . Date Codes Match K2 (1943). The tubes have been tested for Noise, Shorts, Gas and Grid 8Emission. The tube boxes are in very good condition. The tubes have NO imperfections. SEE PHOTOS.... I used my TV-7D/U tube tester with Digital Meter for testing these tubes. This tube tester has been calibrated by ( Daniel Nelson ). If you have any questions or issues after receiving your item, please contact me prior to leaving feedback so that I may address them. I combine shipping on all of my auction sales. Shipping will be free in the U.S.