tube’s failure is such that if they survive the infant fatality, they will be more robust and reliable than transistor. The transmitters on Voyager probes have

tube’s failure is such that if they survive the infant fatality, they will be more robust and reliable than transistor. The transmitters on Voyager probes have been going for 47 years. Those tube were pre-screened ones that survived from infant fatality. It’s like sea turtle, if they survive first few years in the wild, they will a very long lifespan.