Three tubes left now! All tests strong and have matching electronics as well as date codes. Bought NOS by me and never used, only tested. Here's the test results: 3: 16000/16500 4: 15750/16000 5: 16000/15750 These results are in umhos. Tested on my calibrated Heathkit TT1-A using 5998 settings. Two of them have date code 6752 and one have 6726 (this one is missing it's original box) These are very nice. No rattles and all are tight to base. True NOS tubes. Price: $250 a piece. Plus shipping from Sweden.