In addition to to the recommendations above, another source to consider is http://www.tubemonger.com
I've personally only dealt with them once for a very nice pair of NOS Telefunken ECC801s tubes that were priced well below some of the more well known dealers.
As you may or may not already know, many tube manufacturers, in addition to manufacturing their own tubes, sourced them from from other manufacturers and re-labeled them. Tubemonger really knows the tubes they sell and will disclose their provenance. For example, if an orange globe Amperex 12AU7 was made by Mullard in their Blackburn factory, it will be noted in the listing.
Tube rolling is an endeavor of trial and error, only limited by your funds. Recommendations can be useful but what matters is what sounds best in your equipment to your ears. In my experience sometimes a Goliath of the tube world is slain by a David. Good luck and have fun with it.
I've personally only dealt with them once for a very nice pair of NOS Telefunken ECC801s tubes that were priced well below some of the more well known dealers.
As you may or may not already know, many tube manufacturers, in addition to manufacturing their own tubes, sourced them from from other manufacturers and re-labeled them. Tubemonger really knows the tubes they sell and will disclose their provenance. For example, if an orange globe Amperex 12AU7 was made by Mullard in their Blackburn factory, it will be noted in the listing.
Tube rolling is an endeavor of trial and error, only limited by your funds. Recommendations can be useful but what matters is what sounds best in your equipment to your ears. In my experience sometimes a Goliath of the tube world is slain by a David. Good luck and have fun with it.