then why do tubes claim certain life expectancy?
Those are usually just an average, it can be less or more depending on how the circuit is designed. I have a preamp that uses two 866a rectifier tubes that will last decades until the filament burns out.
Those are usually just an average, it can be less or more depending on how the circuit is designed. I have a preamp that uses two 866a rectifier tubes that will last decades until the filament burns out.