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.

The early 1950s CBS 6SN7GT tubes in this precisely matched pair have early black plates and bottom getters. The red print on the bases has the CBS logo. Both tubes test new with low noise.

This Raytheon VT-231 is a military spec 6SN7GT. It has black plates with copper grid posts and a bottom getter. The orange print on the base has the Raytheon logo and reads "JAN-CRP-6SN7GT VT-231." Tube tests as new with balanced sections.

This 1960s Sylvania 6SN7GTB tube has a tall bottle, black plates, and a halo getter with lots of chrome flashing. The yellow print on the base has the Sylvania lightning 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.

This 1960s military spec Tung-Sol 6SN7GTB has black plates, a halo getter, and a brown base. The silver print on the base has the Tung-Sol logo. Tube tests as new with balanced sections and low noise.