於EBAY買了支GZ34, 但賣家說送錯管子:-
I just realized that I accidently sent you the wrong 5AR4 tube. The tube I sent to you is a 5AR4 New Old Stock Code Fj2 B1E1.(7 notches) Test results 62/62.The tube you purchased was a Used 5AR4 code F32 B3A4. Test results 60/60. Since this was my error if you would like to keep the NOS (the better of the two) tube that would be fine. If you would prefer the other tube you can return the wrong tube back to me and I will pay the return shipping via paypal and send you out the correct tube that you purchased. The tube that I mailed you is a better tube but it is completely up to you. I apologize for the mixup. Please let me know what you would like to do. Again I am very sorry for the mistake.
Fj2 B1E1 是什麼管子???