It may have been a gassy tube or a bit close to it’s limits, or both.
NOS tubes are a bit of a dice roll.
OK, just looked, this is likely a new issue copy you are speaking of.
Sounds like it is more likely you hit it’s current limits in repeated ’turn on surge’ spiking and it finally took the tube out.
Sometimes (more likely, actually) it is a VOLTAGE over peak, due to how a power supply is built. Ie, cascading draw that has one tube come on after another and the voltages can spike until all tubes are on line and the current draw increases, which brings the voltage down to manageable levels. Always a problem that one has to plan for when designing or building new power supplies in tube gear. The genalex may have been hit with one over voltage too many. And possibly been a weak example, in the first place.
Check voltage limits in the spec sheets of the given rectifier tube before you try again.
NOS tubes are a bit of a dice roll.
OK, just looked, this is likely a new issue copy you are speaking of.
Sounds like it is more likely you hit it’s current limits in repeated ’turn on surge’ spiking and it finally took the tube out.
Sometimes (more likely, actually) it is a VOLTAGE over peak, due to how a power supply is built. Ie, cascading draw that has one tube come on after another and the voltages can spike until all tubes are on line and the current draw increases, which brings the voltage down to manageable levels. Always a problem that one has to plan for when designing or building new power supplies in tube gear. The genalex may have been hit with one over voltage too many. And possibly been a weak example, in the first place.
Check voltage limits in the spec sheets of the given rectifier tube before you try again.