Do you leave CD players with tube outputs on?

Great posts, thank you! Thanks Raquel for the thorough discussion and to Al for the physics lesson! I previously used a hybrid integrated amp with 7308 tubes in preamp stage and a Consonance 2.2 CD player with tubes in output stage and left those on all the time for a few years without a problem. But when I got the new CD player I was informed to turn it off when not in use. However, I have left the Ayon on for a couple of days now as an experiment, so look forward to listening for changes in sound this weekend.

Thanks a lot Al and Raquel for your informative posts. I have and Audio Aero CDP and it is left in standby all the time which means that the two tubes are receiving power 24/7. I also have an 8 year old OTL which has not had power removed from the driver tubes except for power failures. These driver tubes are all original and still going strong. Don

It would be interesting to compare the cost of 24/7/365 energy consumption to price of new tubes.

The tubes in my Audio Aero Capitol only lasted 2 years because I left it in standby 24/7. Jodi from AA distributor, Globe Audio, recommended I turn the unit off when not in use to extend the life of the tubes.

Most small signal tubes that are used in audio components, such as the 12AX7's and 6SN7's, use indirectly heated cathodes (meaning that filament and cathode are different elements). The filaments in some designs are powered with low voltage ac supplied directly from a winding on the power transformer, in which case tube vs. solid state rectification has no bearing on the in-rush current to the filaments that occurs at turn-on. Better designs often incorporate dc filament supplies, in which case the design may provide better in-rush control.

Sir,

Pardon my ignorance and I hope you do not mind me asking. I am not looking for a debate, I do not have sufficient knowledge on this topic to hold one, and although my questions are pretty direct, I am just trying to understand what you wrote. So, if you do not want to answer my questions, I do understand.

What if there's a thermistor on the primary winding of the tube amp, for example, what happens to the inrush current analogy? At t=0, caps (in the PSU) are shorted, does the inrush current reach the signal tubes?

I have never encountered a tube failing on preamps because of cathode stripping. Some tubes last for ages, like Telefunken for instance, are they not affected by cathode stripping? How many cycles does it take on the average before cathode stripping is really an issue? Is the decrease in gm be considered as a good measure? Is it safe to assume that cathode stripping only matters on high power tubes where bias voltages are over 1kV and not those tubes whose bias voltage is less?

Again, I apologize for being direct and I hope that you will not take my questions as a challenge to what you have posted.

regards,

Abe