TAD Premium Selected Matched TAD 6V6GT-STR Quartet(4pcs) valves This all new TAD 6V6GT-STR combines the exceptionally sweet voiced NOS 6V6GT like the RCA or GE 6V6GTY with up to date demand to withstand the higher operating voltages due to raised AC supply. At same time this TAD 6V6GT-STR forward a surprisingly tight bass which you would not expect with the very best choice of real NOS 6V6GT treasures. We recommend the TAD 6V6GT-STR for all 6V6 applications where a powerful but sweet tone is desired; especcially with Fender Deluxe Reverb and Princeton Reverb, Tweed Delxue 5E3 amp models, the Fender Champion 600 and the all new Marshall Haze 15.