The VTV(vacuum tube valley) preamp tube tester and the Maxi matcher are basicallly the top of the line today. You risk a certain amount of unreliability when you use those old tube testers. Some old Hickock's are still a very reliable tester. You just need to find one that works.
http://www.vacuumtube.com/toppage31.htm
http://www.maximatcher.com/
