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Best Way To Maximize Preamp Tube Life?

I would love to learn how to best maximize tube life. Tubes have a limited lifespan, of course. So when you're not listening for a time, is it best to shut everything off to preserve the "hours" left on the tube's life? OR does the act of powering off/on itself shorten tube length as well? If so, by how much? Something like "powering off/on costs 3 hrs of tube life, so taking a music break of less than 3 hours, better to just leave it powered on." Or 1 hr, or 10 minutes, 6 hours, etc? Where is the tradeoff point?

In my system FYI, I am running a Don Sachs preamp with 4 6SN7s and 1 6BY5 rectifier.  Don says the preamp is only running the tubes at 40% of their rating. I would greatly appreciate some input from people with tube knowledge. Thanks in advance!
sid-hoff-frenchman
femoore12's avatar
femoore12
683 posts
 
I really enjoy reading through this kind of discussion. I am new to tube preamp/amp ownership and I honestly had no good information on how to approach the maintenance. I have been turning my system on about 15-20 minutes before I start playing music just to let it warm up. The preamp and amp are usually on for 3-4 hours on average. Some days they will stay on 8-10 if the weather is bad and I am just chilling in the house. 

I definitely need to buy some spare tubes.

Cheers!
holmz's avatar
holmz
2,328 posts
 
Best way to extend tube life is probably going to SS…
I should replace those 20 year old tubes in the preamp. But it sounds pretty good the way it is.
sns
3,003 posts
 
I'd never leave any tube equipment on 24/7. Some have standby mode, in which only heaters are lit, some also have soft start circuits, both minimize wear. The rest you're choosing between wear and tear from being used 24/7 or same from inrush current, voltage. So, sort of depends on how often and how long you listen to music. Daily listening, may as well leave on. Still, I don't like leaving tube equipment on unattended, too many bad things can happen. Preamps slightly less worrisome here, still?

I'd never leave any amp on 24/7, regardless of how often listening. I've always thought ss best for multiple daily listening sessions.
I subject the expensive tubes I prefer to the lightest wear possible, they are not simply disposable items to me.  I'm once a week, long term listening session guy.

ghdprentice
6,363 posts
 
I have purchased a spare set of tubes for all my components. In the unlikely need to trouble shoot they are there. Also, when the 3,000 hours are up. Sure, they may last longer.
gkr7007's avatar
gkr7007
136 posts
 
I also have the DS preamp and the 6by5 and its variants are anywhere from 6 to 20 bucks for NOS that should last 8 to 10k hours...at least.  The 6sn7 tube is not in short supply and aren't very expensive for NOS either.  I happen to like the Shuguang Dawning series WE6SN7PLUS tube and have a spare set.  Unfortunately they are out of production but if you get past 50 hours or so on them they should last you thousands of hours......especially in Don's preamp.  Basically, buy a few spares of the 6by5 and a spare set of the 6sn7 and you'll be good to go for many years assuming you get a reliable set.
No 24 hours on.  No waiting an hour or two for warm up.
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