B&W TV Philips 21TG100U Line timbase fault.
The FD092 scanning coils were not equipped with picture shift magnets so an older type of of magnet once used for 90 degree tubes is being used to position the picture. Many early 110* scan coil assemblies also employed this type of shift magnet.
The Philips 21TG100U continues to work well since the replacement line output transformer was fitted. The PL81 line output valve is holding up well also. A spare valve is kept inside the cabinet should the valve fail. The only issue reported was progressive reduction of picture height, replacing the resistors between the height control and the boost HT cured the fault.
The parallel connected 220K resistors make up to the correct values that were in the components list. R619 (0.12M) and R622 (0.1M).
Coming up next, the line output transformer substitution in the Stella version the Philips 21TG100U, the model ST1011U.