Both tubes tested Strong NOS (110%+ nominal mutual conductance) and tightly matched on a reliable and recently calibrated Mercury 2000 tube tester with the following results for mutual conductance:
Tube 1: 1,190/1,210 (119%/121%)
Tube 2: 1,190/1,190 (119%/119%)
Tube 3: 1,100/1,180 (110%/118%)
Tube 4: 1,200/1,000 (120%/100%)
Good tubes start at 700 and new tubes (incl. NOS/NIB) 1,000, and the Mercury 2000 tester's rated mutual conductance (nominal) for new tubes is 1,000. Test results can be seen in the pictures. In case you wonder what all these numbers mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to a tube's ability to amplify sound, so the higher these numbers the stronger. No short, leakage or gas.