T1154M Ser. 86102 Restoration (/cont)

Before and after shots of the inside of the valve compartment  

This proved to be rather interesting ...

See the photograph on the right. These components are associated with the modulator. As part of the restoration, the block capacitor needs to be ‘re-stuffed’ . It also needs to have the rust removed from its case. In order to do all this, it is first necessary to remove it from within the valve compartment, which is not an easy task! With the T1154, it was a case of ‘once built, never dismantled’. Thus getting access to the various screws securing this little sub-assembly in place actually requires the removal of the two PA-valve top-cap assemblies, particularly the one nearest the rear of the compartment since its bracket completely covers one of the screws. However, see the red arrow in the left photograph and notice that there is a gap between the bracket and the dividing wall in the compartment. This is a manufacturing error. There are two distinct top-cap assemblies with different stores numbers. The top-caps themselves are not identical since the HT-lead exit-holes have to face each other. In the case of the rear assembly there is also a hole in the mounting plate to give access to the

head of one of the screws securing the modulator component sub-assembly. In this case, the top-caps had been transposed so that when the top-cap assemblies were fitted into the compartment, and this would be after the modulator components were fitted, the top-cap assemblies were in fact reversed. In this case, the one nearest the front had the extra hole. The rear one didn’t therefore and thus when secured to the dividing wall, the plate buckled as it fouled on the screw head. To rectify this 70-year-old mistake, I carefully dismantled both top-cap-assemblies and reassembled them correctly ... giving them a good wire-brushing at the same time to get rid of the rust..