Tube upgrade recommendations

[Atom Shop]

I have tried some of the russian equivalents and they do sound very good.
The best sounding tube I have used in my Eros is a pair of NOS Genalex Z729's

Deb

I luckily found a pair of rare GEC Z729's on eBay. ;D Absolutely without a doubt, the best tube I've now heard in an Eros.  ;D  (Despite my previous goings-on about my wonderful Tesla's.) Simply unbelievable!!!  ;D ;D ;D

Atom