The minimum is equal to 65% of the life of the tube. No shorts or gas.
(1) NOS Testing Mullard F31 BOJ Fat Base OO Getter 5AR4/GZ34 Guitar Audio Tube Tests at 60/60 with Min. Value being 40/40 so this tube tests 100% (((((I do not lower declared value or write as gift due to US Laws))))) I no longer ship to China & Vietnam due to lost packages in Custom's
Model 5AR4 GZ34. Tube Type Rectifier. Manufacture Date 1958, August — RCA Harrison, NJ plant. Labeled for RCA made by SYLVANIA. Common Use Guitar Amp. Condition NOS. ALL TUBE AUDIO. Tube Specifications.
Rare made in Japan 5AR4 Rectifier Vacuum Tube. Tested and works. Enjoy :)