Where can I send my tubes for testing?

How about the HICKOK 533A? There is one on Ebay right now.

Peter, the 533 is decent but only really middle of the road. the 539 B or C is one of the best hickoks, as is the 580 that is on Ebay right now too. Also, I'd look for a TV-7 (D preffered), these are a little less $ than the hickoks but the same circuit. the tubes you list should be able to be tested on any tube tester since the 1940s.

have fun!
-Ed

Ram Labs at http://www.tubeaudiostore.com/index.html. Probably the best tube tester out there and very reasonable prices.

Many tube dealers will also do tube testing.  A very good dealer of this kind is TC Tubes in Minnesota.  I have sent Tyler and Chelsea tubes several times for testing.  They do a couple of different levels of testing depending on what you need.

They also sell high end tested tubes of many varieties.

WOW!  Impressive resurrection of a 13 year old thread.  Really dug into the archives.