These are beautiful 6L6G tubes from the 50’s! They sound awesome and are very sturdy in construction. Russian Military grade. The 6N3C / 6P3S Tube or 6pi3C is the Russian equivalent of the 6L6GC and 5881. Very cool box!
Tested on the RoeTest professional computer testing system.
Matched sets are matched by plate current and transconductance using the new Maxi Matcher 2