1951  ZENITH   "Tennyson" 

Porthole TV  

Chassis 24H21

First images on the 19"CRT after an extensive recap of the chassis and replacement of the vertical output transformer. Obvious height issues with vertical linearity problems. Lots of sorting out to do before this vintage TV will be put back in use.

Bright horzontal lines at the top and bottom of the raster

Serious vertical linearity problems when an attempt is made to fill the height of the screen.

Vertical linearity is improved with some adjustment to both the Vert Lin control and Vert Size control. Overall height is sacrficed to improve the linearity.