Hi guys, 
 
I possess a wonderfull, like new, melos sha-gold and a pair of vintage grado rs-1!!!  
I need a pair of very good tube to use but, I've not sufficient money for experimenting different options...  
 
So between these tubes, which one is the best for my needing? 
 
Mullard E88CC-01 
Telefunken E88CC 
Amperex 7308 
Siemens E88CC A0 
 
If you have other options in mind please let me know!  
Thanks in advance!