The 6SD7GT described as a semi-remote cut-off voltage amplifying pentode is semi-vari-mu. The design use was as a high gain amplifier at RF or IF in radio receivers. The 6BA6 is regarded as the successor valve and is an all glass B7G based valve.
The feint etched Type designation can be seen on the full sized image.
The Raytheon logo on the base skirt together with Made in USA.
The UK Government specification for this valve is the CV865.
The thin metal tube envelope is 29 mm in diameter and, excluding the IO base pins, is 67 mm tall.
