I use these 12ax7's. "The fisher"
http://www.ebay.com/itm/Telefunken-12AX7-ECC83-Tube-The-Fisher-Smooth-Plates-O-Gtr-West-Germany-/222022460053?hash=item33b191e295:g:Ta0AAOSwezVWvjpv
you can get these for a fairly good price. Cant beat the telly sound.
Changing the input tubes in my amps...