Report Review for product Vacuum Tube - 12AX7 / CV4004, Mullard Reissue

I purchased these 12AX7's for my Marshall JVM-410H. Out of 5 tubes only 1 of them were usable, the other 4 tested bad and were worthless. They were so far off, they were causing 2 of my EL34's to red plate as soon as B+ was enabled. They looked pretty but that's as far as it goes. Next time it will be JJ tubes ONLY no more fake Mullard branded tubes for me.