45 triode tubes

The 1940s Sylvania 45 triode tubes in this precisely matched pair have ST bottles, black plates, and bottom dish getters. One has the Sylvania logo and the other is labeled for Raytheon. They are matched for both current draw (27.4 mA & 27.0 mA) and Gm.

The Sylvania VT-52 tubes in this very rare matched pair have bottom getters and single black plates with ceramic supports. They come in their original boxes. Both tubes test as new and are matched within 2% for transconductance (Gm).