stupid tube question of the day

Another question: Any suggestions or guidelines on turning tube gear off when taking a listening break, and then back on again when the listening session resumes, if the break only lasts a couple of hours? The point of the question is predicated on the notion, perhaps wrong, that the process of turning tube gear off and an again -- by itself -- stresses and preliminarily ages tubes. Does the suggestion or recommendation change in the case of amplifier power tubes versus signal/audio tubes?? Thanks

Ckoffend, your comment is consistent with my thoughts too. However, I am not an electronics techie, so I have no real basis for formulating a view, ergo why I asked the question.

There are a number of A'gon members who are heavily involved in tube based electronics. To be courteous, I will not mention names or their A'gon handles, but perhaps if they catch this thread, they will chime in with some recommendations and guidelines that are based on their considerable knowledge and experience.

6bq5 -- I can't speak to other tube makes or gear, but in the case of ARC, the factory recommends that power tubes in more current models, such as 6550Cs, be replaced every 2000 hours. These particluar tubes bias at 65 mV. ARC has replaced the 6550C in some amps with a new tube, the KT-120, which is supposed to be more robust. Time will tell if service life will be extended. However, in the case of pre's and other input gear, such as phono pre's and CDPs, the more recent models use 6922s and 6H30s. ARC advises that these audio/signal tubes be replaced at 4-5,000 hrs. Certainly in the case of ARC gear, I am not aware of any tube, at least in current models, that has a 10,000 service life. Perhaps, longer tube life might be found in gear from other companies.

I think the question at hand is whether there are suggestions or recommendations out there in audio-land that can help extend, or at least not shorten, tube life -- whatever the factory's recommendations might be. I think you put at least 2 recomendations out there in your post. Thank you. Your advice makes a lot of sense.