EKCO 330T

The picture suddenly faded away leaving a
raster; the sound also faded gradually to a muffled, distorted sound. When next switched on no raster
appeared but the sound came up at first, only to fade once agaIn.
I have replaced the U26 and U191 and the line output transformer was renewed recently.-R. James (Dagenham, Essex). You should check the line linearity choke. which frequently slides down the former to short to chassis. Also suspect a faulty new line output transformer.