NOS GEC KT66/CV1075 – Clear glass, double halo getter version which are extremely hard to find in large enough quantities to provide extremely tight matching! We were lucky enough to obtain a large supply NOS in original commercial Marconi and military cartons. Pairs and matched quads available. This is a suitable replacement for any KT66 6L6 tube type. $375 per tube. Enter qty 2 for matched pair/ qty 4 for matched quad.