Tested Matched Pair Military Sylvania JAN CHS 6SL7GT Tubes Codes 150 222 6SL7 GT
Tested Matched Pair Sylvania JAN-CHS-6SL7GT Tubes. Date Codes 150 and 222. Tubes are closely matched for Gm tests within 5% (see below) and internal structure - they are identical. Green lettering on black bases.