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The picture appears broken up when the set is switched on
from cold. Slight adjustment of the line hold control
corrects this, but when the set has warmed up the picture
starts to roll. This can be stopped by adjusting the field hold
control, but after a few more minutes the rolling starts again
along with pulling to the right. The video, sync and line and
field generator valves have been replaced without improving
If you look on the upper left side panel you will find two
large resistors. Normally the second one, which should be
coloured orange, orange, orange (333(33k) will be found
discoloured, indicating overheating. Change this resistor,
which is used to stabilise the video output pentode’s cathode
bias voltage at 3.3V. No other action should be necessary.

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