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Test Card F was the BBC's longest-running and most famous test card, featuring Carole Hersee and Bubbles the Clown. There have been many different Test Card F variations.
The test card was used to test colour signals and grey-scales - if the border lines ever blurred it meant that the focus on your set needed adjusting.
Негізгі бет BBC2 Test Card F - Famous, Long Running Test Card featured Carole Hersee and Bubbles the Clown
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