NOS vacuum tubes made with Blue Glass. No longer made. High quality, brown base, top halo getter. Beam power tube/valve numbers 6L6GC, 6L6GCR, 6L6G, 6L6GA, 6L6GB. These tubes are compatible with 5881 and any 6L6 .
Tested and matched on a RoeTest professional computer testing system, the best tester available today. Also matched on a Maxi-Matcher 2.