Tube Preamps Should Have This Feature

@ghdprentice  both my pieces of equipment have tube rectified power supplies, no solid state devices in the power supplies.

I often advise getting your own tube tester.

All my tubes, preamp; rectifier; power: take less than 30 seconds to warm up to measure their strength. Wait another 30, another minute, no change, i.e. they are ready to go pretty darn quick.

Perhaps as others have said, it is other internal parts that benefit from longer warmup. 

In any case, for a quickie 20 minute listen, turn it on, play the chosen content, MOST tube amps will sound darn good. it's the chosen content that will take you there.

@invalid

Thanks for your reply. Really. That means you are running them 8,700 hours a year.

I have been told that tubes… particularly power tubes age more slowly when on but not in use. Maybe that has something to do with it.

My Audio Research gear recommends tube changes after 3,000 hours. When I do this I hear a bit of and improvement, as in the older tubes were starting to roll off a little.

What kind of gear do you have?

@ghdprentice  power tubes do age faster, but those are in the output stage of an amplifier, not in the power supply section usually, though some power tubes can be used as rectifiers and in some regulation positions.

@invalid 

That makes sense the lasting longer would not extend from power tubes to rectifier and smaller tubes.

So, what is your preamp / DAC.