RESTORATION OF A 1951 BUSH TV22                                                                                                 Page 1


Bush TV22


Conceived in a Britain determinedly looking forward to brighter times after the war, today the Bush TV22 has become the quintessential "vintage television" and is something of a style icon. And there is much in its favour: the curvaceous late-art-deco bakelite cabinet, the reliable and well-made chassis, and its compact size - which means that happily many of these sets have survived, having been small enough to tuck away under the stairs or carry into the loft. The price for this portability was the small 9-inch picture, though a Mullard tube ensures it is of high quality. Magnifying lenses were available as after-market items, as were ITA converters.

Today, thanks to its style and practicality, the TV22 has become a popular way to for the public to enjoy 405-line television and many have been restored. And of course 15 years ago the TV22 provided the inspiration for the Retrovisor, now becoming something of an antiquity in its own right !


Well, it's time to get started. Once the back/bottom card panel has been removed, the first job is to remove the knobs. Their fastening screws are accessed through slots underneath.


Before removing the cabinet, don't forget to unscrew the wire that connects the internal cabinet foil to the chassis.

Then, once the four screws holding the cabinet to the chassis at the rear have been undone, the cabinet simply slides forward off the chassis.

This set looks a good 'un.

The lower RF/IF deck is unscrewed and slid out from the rear of the chassis. But first, the multipole connector must be carefully eased out from its socket (arrowed).

Next it's good practice to remove the tube before any operations are carried out on the chassis.

There's a rim band at the front to undo, the EHT connector and the tube socket to remove. Also a clamp screw (arrowed right) and two focus magnet mounting screws (arrowed left) must be undone...

In this set the ion trap magnet (not shown here - previously it had been sitting near the blunt end of the left arrow) had already been removed to facilitate tube testing.

...and lastly not forgetting the multipole connector feeding the scan coils.

The tube can then be lifted carefully off complete with the focus magnet supported with one of the hands. Some may prefer to leave the focus magnet bolted in position on the chassis and carefully withdraw the tube neck forward through it.



It's a nice idea at this stage to date the set. A couple of capacitors here say March and April 1951 so the set was likely manufactured shortly after that, in fact just in time for the 'Festival of Britain', which opened in May.

Having removed its surrounding can, time for a quick look at the line output transformer. There's some melted pitch - evidence of previous overheating. Rusty laminations can cause this, though in this case I am strangely optimistic these will prove OK.

Before work on the chassis starts, the LOPT will be taken off and its pitch coating removed. More anon...



The next thing will be to clean down all the various major components which make up the insides of this set.

One of the bits that should come off is the scan coil assembly on the tube neck. This is often very tight. An application of WD40 should soften the wax, though be careful not to get any on the tube's aquadag coating.

Always wear goggles when handling a tube, even one that seems as robust and inoffensive as this one !

Gentle twisting and upwards pressure was applied on the scan coils with the fingers placed under the ring at the bottom (arrowed) and after an initial jerk the scan coil assembly slid easily off the neck. When applying pressure, don't be tempted to grip the metal lamination housing or you could damage the scan coils beneath.

As the scan coils emerge over the tube base at the end, be sure to simultaneously gently push down on the base, since sometimes the bond may be weak and it may become detached.

The story continues here ...
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