after 3or4 hours set would switch its self off. If then I switched button off and waited 15 mins then switched on again, there would be a tick tick tick then the set would work ok. But now set will only occasionally come on when very cold. Any ideas?. I should throw set away but sentimental value.

Mark P, November 2005

It sounds like it has dryjoints(bad solder connections) although components will be changing value after this period of time and the tube will be a bit tired. It should however work if the joints are seen to be going over them with a soldering iron.
As it has been causing problems for some time it my be obvious with a ring around the joint and may even be a bit black.
If difficult to locate you could turn the lights off to see a spark to locate but really shouldn't use the set in this condition or more permanent damage will result.

sparky, November 2005