6N3P, 2C51 = 6CC42 = 5670=6n3 Strong Matched Pair, Made in USSR in 1968 Tested with professional tube tester device L3-3. Checked for GM, shorts, leaks, gas. OLD STOCK NEVER BEEN USED. The items will be carefully packed and shipped from UKRAINE by International Air Mail. Transit Time will be approximately 10-26 days. The tube contains gold 0.555 milligram. Filament voltage,V 6,3 Filament current,A 0,27-0,33 Anode voltage,V 150 Anode current,A 0,005-0,012 Anode power,W 1,8 Grid1 voltage,V minus 2 Steepness,mA/V 4,1-7,8 Reverse grid current,uA 0,1 Microphnic noise,mV 100 Gain 28,0-44,0 Socket type rsh8