> Make sure you match your power tubes though....
This is usually meaningless unless the tubes have been burned in for 24-48 hours before matching, and unless you get your tubes from a relative handful of tube resellers, they won't be.
The import tubes you get from importers and non-specialty importers are very raw, unculled stock and tend to change after a few hours use. The readings you get on a tube will change a little or a lot after they've had decent burnin. This tends to be worst with Russian tubes, in my experience.
Buy from a good reseller - Lord Valve, KCA, Triode, etc. - or pay the price later. Anything less is false economy.
Caveat emptor!