The NS raster correction circuit of this set can be made more reliable by replacing the capacitor 12C1 (located on the sub-panel at the top right hand side where the degaussing coils plug in). Only use a 47nF 630V polycarbonate type. At the same time ensure that transistor 5TR6 in the blue horizontal amplitude anti-modulator circuit has a 22R 1/2W resistor between its emitter terminal and the chassis. [Beovision 3400 K, Beovision 3400 SJ]