The 6X8 is a triode pentode for use as oscillator and mixer in TV receivers using an IF of up to 40 MHz. The 6X8 can be used for AM/FM receivers as well as television receivers.
The 6X8A differs only in that the thermal characteristics of the heater are designed to minimise surces during warm-up.
Types 19X8 and 5X8 differ only in heater rating. Type 6X8 was introduced in 1951.
The Westinghouse name and other details are on the envelope. The pentode anode can be seen face on. The bright sheet behind the anode is the beam forming plate.
In this image the pentode is on the right and the triode on the left of the common cathode. The beam plate can be seen between the copper grid support and the anode on the right.
The common central cathode and heater with the white oxide coating over most of its length. The triode single grid is at the bottom of the picture. The cathode connection is by a ribbon.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
Reference: Data-sheet. Type 6X8 was first introduced in 1951. See also1951 adverts.
