Here is a Beautiful Vintage 1950\'s Supreme I-177-B Dynamic Mutual Conductance Military Tube Tester. Signal Corps US Army. Serial # 9. This came from a retired electronics vet who took it out of service from the Military in 1961. It is in very nice cosmetic and working condition. The face plate is missing a few screws but it does not effect it\'s performance. Clean inside and out. It meters right on using a 6L6 calibration test tube. This will make anwonderful addition to anyone\'s collection. Money back guarantee you will not be disappointed.As always, all of my sales start at $9.99 with and I offer a 60 day money back guarantee. Click the \"Enlarge\" tab to view all 12 pictures for details. Email, text or call Mike with questions. (206) 660-8289. I do not offer Buy-It-Now\'s and do not end my sales early.Buyer to pay actual shipping of 24 lbs.