Full Sleeve of 5 electrically and physically matched vintage NOS/NIB GE 6201/Premium 12AT7 (Re-Labeled National) vacuum tubes made in USA. Electrically tested using a calibrated Sencore MU150 Continental II Vacuum Tube tester. These tubes test AS-NEW and have never been used. Due to the nature of vintage vacuum tube electronics, these tubes are being sold for parts AS-IS and will be properly packed for shipping. Please check my extensive feedback rating for confidence.