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The biggest change was the development of higher deflection angle crt's like the 10BP4 and 7DP4. All the pre-war crts have extremely shallow deflection angles and are very long forcing the cabinets to be designed as they were. With the developments during the war on crts, shorter ones could be produced allowing for smaller cabinets with no need for indirect view.
Another development was that of miniature tubes which allowed for much smaller chassis designs.
Darryl
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