Ruby 6L6GCMSTR PC 30 Power Vacuum Tube Single
Ruby 6L6GC-MSTRs are designed to work in the most demanding applications with their thicker glass and sturdy construction. They pack a lot of punch with a sweet musical tone, and are made by the Shuguang factory as a Philips STR-415 copy. These are the same tubes Mesa re-labels as their STR-440s.
Model: RUBY 6L6GC-MSTR