Reporting question for Vacuum Tube - 6550, JJ Electronics

Vacuum Tube - 6550, JJ Electronics

I recently bought a matched pair of T-6550 JJ tubes, need a third matched to that pair. How do I go about ordering it.

When ordering a single tube, you may make a note in the comments section asking us to match your tubes based on the Apex matching information on the tubes/tube boxes. Please include that information when making a note.