Re: Baird T5 restoration project.
It's getting close to the stage where a CRT must be fitted in the cabinet to confirm that all the new parts are in the correct positions. But it would be certainly unwise to use the original tube for the purpose. Once that component has been installed it stays in unless other reasons arise. With TV sets having a 12" diameter tube I have a down-to-air CRM121 which is used to determine the installation arrangements before a good tube is fitted. An example is my Beau Decca TV recreation.
The Cathodevisor CRT has a 41mm neck diameter. A wound steel tube is fitted over the CRT neck, the line scanning coils are fitted close to the flare of the bulb and the frame scanning coils are mounted on the CRT mounting board.
The dummy tube won't be a CRT but a length of tubing attached to a wood disc which will be placed in the position where tube bulb rests on the upper board. The attached picture shows a piece of plumbers pipe which is almost the same diameter as the CRT neck.
DFWB.
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