Selling sets of 6BX7 tubes, in the quantity of 6, for use in Glenn's GOTL amp. All are used and are various brands, most are GE, there are some RCA and a few are Sylvania. All are top getters they have D gettes or Halo getters and black plates, all have two micas. I will test your set of 6 in my GOTL, to ensure that they all get along (no "oscillation" problems). Price is $39.00 USD for a set of 6, plus actual shipping costs. Please PM to discuss shipping cost to your address.