Tube Preamps Should Have This Feature

mulveling, I thought tubes didn't like on/off cycles. 

I wait for 30-45 minutes after turn on. Do I hear a difference ? YES !  First ten minutes is no go, after that you can go but better wait a little longer. Tubes or capacitors or both, it's exactly as VAC recommends.

Yeah, reissue tubes if you must save.

Saving on groceries to buy more tubes is a great idea. What if the man already does it ? And what if his reasons have nothing to do with expenses ?

Don’t know about other amps, in the case of my VAC it s advised to give it at least ten minutes to stabilize before listening and forty five minutes is ideal. But it is integrated amp, with power tubes too. Still I would think at least ten minutes for a preamp.

Tubes done right have a certain 'glory' in presentation, I don't think it can be replicated by transistors. It is felt in addition to heard.

And speaking of tube power, with the right amp/speakers match, those 60 ultraliear watts that I get feel like more than double. 

Well, maybe you need an inexpensive transistor preamplifier for that to complement you tube one. Just switch the cables, it's quick and easy.

Life is long enough to spectacularly screw it up.

Agree, In my limited experience SS requires longer warm-up time to sound best. 

I turn my Avatar on once a day and turn it off once a day, with rare exceptions. I don't like burning tubes for nothing but it appears that I do it. I feel better about this than about multiple on/offs a day. Terrible for ecology, I know, but I compensate with other things.