Mullard EL34 xf2 vs xf2 coded tubes

Hello Alex. They are the same tube produced by mullard and relabelled. Many were relabelled for Dynaco,Fisher, McIntosh [to name a few] from of the era.Easily identified by the etched date code and a hole in the bottom of the guide pin.

Yes, but is there any sonic difference between xf2 coded tubes and later production xf3 coded tubes?

...Oops, I made a mistake in my question - "xf2 vs xf2", while it shoul read "xf2 vs. xf3 coded tubes".

Best regards,
Alexander

2's are better than 3's.