6SN7 / 5692 tubes

This early 1950s CBS 6SN7GTB tube has early black plates and a bottom getter. The red print on the bases has the CBS logo. Tube tests as new with low noise.

This 1960s Sylvania 6SN7GTB tube has a medium bottle, black plates, and a halo getter with lots of chrome flashing. The black base has yellow or green print with the Sylvania logo. Tube tests as new.

The 1960s Sylvania 6SN7GTB tubes in this precisely matched pair have black plates and lots of chrome flashing. The yellow print on the bases has the Sylvania lightning logo. Both tubes test as new and are matched for both current draw (mA) and Gm.