Why did transistors replace vacuum tubes in most computer applications by the end of the 1950s?

By the end of the 1950s, transistors had largely replaced vacuum tubes in computer applications due to several critical technical and operational advantages:

• Size and Density: Transistors are inherently small, allowing a large number of them to be packed into a small space. This enabled the construction of more compact and complex computer circuits compared to those built with bulky vacuum tubes.12
• Power and Heat: Unlike vacuum tubes, which require a heated cathode to function, transistors operate at room temperature and do not require a heated filament. This significantly reduces power consumption and heat generation, preventing the overheating issues common in large-scale vacuum-tube systems.12
• Reliability: Vacuum tubes are fragile, prone to failure from thermal fatigue, and have a limited lifespan. Transistors offered a much more reliable solid-state alternative, which was essential for the stability of digital computers.134
• Performance: Transistors allowed for lower propagation delays, which is vital for high-speed logic applications. Additionally, they eliminated the "warm-up" time required by vacuum tubes, allowing computers to be ready for operation immediately.13