Two Tested 5670 JHS (2C51) Sylvania NOS NIB Audio Receiver Pre-Amplifier Vacuum Tubes. Gray plates, two spacers, isolation plates, large halo wire getter frames and top getter flashes. Please review the photos for more detail. Excellent to good test results for Gm.42 / 44 and 29 / 38. Is the 60% reject point. For reference we use a calibrated Military TV-7 Tester. The item "5670 JHS (2C51) Sylvania NOS NIB Audio Receiver Pre-Amplifier Vacuum Tubes Pair" is in sale since Monday, February 8, 2021. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "chukv" and is located in Westwood, Massachusetts. This item can be shipped worldwide.