List - $69.95

This is a SED 6550C carefully selected, tested and matched by the folks at Ruby Tubes. It is a powerfull and dependable tube modeled after the GE 6550.

Like all Ruby power tubes matching is done by both plate current and transconductance. Each tube is then marked with the plate current and transconductance for that tube and a matched pair or quad will include tubes that have tested the same.

And of course it comes with the 6-month Ruby Tube Warranty - If one of their tubes fail during the warranty period, they will replace it at no charge.