Good x-ray tubes will do the job of functioning the right way even under the most difficult conditions. The average lifespan of an x-ray tube is about 3 to 7 years, depending on how it is maintained and taken care of. If you go too long without using your small focal spot x-ray tubes, it can cause damage. If you need more information on things like small focal spot x-ray tubes, visit Micro X-Ray Inc at https://microxray.com/products/mini-focus-glass-x-ray-tube/