Museum of the Broadcast Television Camera

RCA 5820 3 inch Image Orthicon tube and scanning yoke

RCA 5820 3 inch Image Orthicon tube and scanning yoke

The standard 3 inch Image Orthicon tube, RCA type 5820 as used on the TK-11/31. The scanning yoke is upside down in this picture, at the top is the pipe were the flexible hose from the blower attaches. It is important that the tube target is maintained at an optimum temperature.
To the left is the focus control which moves the yoke forwards or backwards as required. It runs on a roller bearing assembly which attaches to the top plate of the camera and the yoke hangs down from that.