Ruby Tubes 6L6GC MSTR Matched Pair$57.95 Our best 6L6GC tube. Full sounding with good power. A rugged copy of the Philips STR tubes. Quantity Add to cart SKU: 6L6GCMSTR-2 Category: Ruby Tubes Tags: 6L6, GC, MSTR Reviews (0) Reviews There are no reviews yet. Be the first to review “Ruby Tubes 6L6GC MSTR Matched Pair” Cancel reply Your email address will not be published. Required fields are marked *Your rating Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Notify me of new posts by email.