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Some years ago I worked for a company that repaired Radios and TV's we had a call that the coin box on this ladies tv had stopped working.

On arrival at the house we examined the tv a 12inch floor model and could not find a coin box. The lady of the house explained that she put a shilling in the slot at the back and the tv worked, on a demonstration we discovered she had been using one of the vent holes in the back board that sloped away before dropping vertically to the floor.

On removal of the back board we discovered how the system worked the fuse had blown and on dropping a shilling through the slot it had bridged out the fuse until the vibration from the mains powered speaker dropped the coin into the lower speaker cavity. The reason that it stopped working was because the fuse holder blades had burnt off !!

We replaced these and supplied a new fuse and also returned the £50 in shillings (to the new sparks around 20 shillings to the pound) old money