For television reception, Polevoy (Vekshinsky's laboratory) has designed two types of tube. One is a small type of tube having a screen diameter of 120 mm. It is equipped with electrostatic focusing and magnetic scanning. The diameter of the beam is 0.6-0.8 mm and its current is 150 microamps. The slope of the characteristic is 8-10 microamps/volt and the ratio of the accelerating field on the second and first anodes is 5. The other tube is larger and having a screen diameter of 200mm. The fluorescent screen is willemite.

Employing the small type of tube, Gourov's laboratory have designed a commercial 120 line vision receiver having a thyratron scanning circuit. In construction it has the form of a tall cabinet subdivided by horizontal partitions into three compartments, one above the other. The top compartment contains the tube with the magnetic scanning system, a potentiometer for regulating the depth of modulation and a rheostat for regulating the brightness of the picture. In circuits with amplifiers, the dividing stage and the stage for the suppression of the return path of the beam. The loud speaker is also accommodated in this compartment. The bottom compartment is for the rectifiers which are run off the 110 volt AC mains. A 240 line televisor of the same type is at present undergoing tests.

Courtesy of George Lemaster