Perfectly MATCHED and BALANCED QUAD 6N1P-EV GOLD GRID Military USSR tubes. 

Same date 1980. =E88CC 6DJ8 6922= 

Condition: NOS - never used.

Made in USSR at Voskhod plant (Rocket logo).

OTK stamp - the sign of quality control.

Prefix "E" means perfect longevity and reliability not less than 1000 hours.

Prefix "V" means perfect shake and vibration resistance.

..................Ia1..Ia2..S1..S2

tube №38..7,8 7,4 4,70 4,45

tube №39..7,8 7,5 4,60 4,50

tube №45..7,8 7,6 4,60 4,60

tube №46..8,0 7,4 4,55 4,45

I test tubes with the Best USSR tube tester L3-3. It has official verification (calibration) certificate. 

You can see the photo of this document.

Ia has acceptable range 6--7.5--9 mA 

S  has acceptable range 4--4.5--5.4 mA / V