Good luck finding tubes of this caliber in this condition any more. Minty pair of the vaunted early 1960's yellow label Sylvania chrometop 6sl7gt. Elongated, black oval plates and top getters, phenomenal soundstaging and 3D imaging. There is a reason the sylvania chrometops,in any guise, remain at the top of most pples must have lists, they were built to bulletproof standards and sound fantastic. These test as basically NOS and have the same production codes and etched codes, great for giving you that balanced soundstaging. Paypal add 3%, buyer pays shipping, all conditions firm, meaning they will only sell or the listed price and will not sell' shipping included' thanks.