I wholeheartedly second all of the above suggestions. Not meaning to trash other tube sellers on the 'Gon or on e-bay, there are tubesellers on the net that are quite disreputable, selling fakes, relabeled tubes, used to death tubes, and the like, posing them as NOS or "matched". I recommend that you have access to or own for yourself a good tube tester before buying tubes in this fashion. Tubes with shorts can damage your equipment (don't use your amp as a tube tester!). Some individuals on the net will buy good tubes from one of the reputable venders, use them for 6-12 months or so, then put them back in their orignal boxes and advertise them with the test numbers from when they bought them. In short, beware.