"Pair of NOS (New Old Stock) RSD ECC83 vintage electron tubes.
These two RSD ECC83 are NEW and supplied with original box.
Tube1 B+A: Vf. 12.6 , Vg -1,5 , Va 250 , Ia 1.9 mA
Tube 2 B+A: Vf. 12.6 , Vg -1.5 , Va 250 , Ia 2.1 mA
Test values must be different from one tube-tester to another."