Preamp tube


Looking for suggestions. I’m considering changing the 12AX7 preamp tubes in my Jolida 1000. Right now I’m using Genalex Hold Lion 12AX7/ECC83. Any suggestions and sonic benefits. Thank you in advance.
128x128luvrockin
Why not try some NOS? American and European tube companies in the older days of audio  made great vacuum tubes. Sylvania, RCA, GE, Mullard, Raytheon and many others...
Sylvania-Baldwin green label circa 1960’s is a nice sounding 12AX7. They can be had on ebay at reasonable prices!
 I use NOS Telefunkuns from the 1960's.  They are expensive but were a clear improvement over my existing tubes.