300Bs - does leaving them on shorten their life?

STUPIDO - Noted!!! Thanks 

I’ll be turning them off.  heard one post about the trauma of powering up, but may live with that risk. It’s and expensive fix if I hasten their demise.

If you have some uber rare and expensive 300Bs, you could use a device called a "Variac". This device limits voltage to reduce start-up stress on your tubes.

This is a frequent debate that is never settled.

One side believes leaving tubes on is a fire hazard and uses up the tube faster and the heat also wears out the rest of the amp sooner.

The other side believes that turning your tube amp on and off is the most destructive thing you can do to it. Of course there are others with opinions all over the spectrum between these opposing poles.

My advice is to call up the manufacturer of your amp (even if you didn’t buy it new) and do whatever he advises.

I have NEVER heard a manufacture tell anyone to leave the "Power Valves" on.. EVER.. Then again, what do I know..

The little signal valves, I've seen stay on for months at a time..  Some designs are VERY low voltage and the valves last 15-20,000 hours..  I've not seen power valves do that.. 5,000 hours is really a push. 2-3000 is more like it..

I've never seen a signal valve erupt, and breach the glass, rectifier and power valves, I have...

What about some of the hand made valves.. 4K+ for a pair. Rebuildable.
Maybe I should start making them out of old pint and quart canning jars..

Gears are grinding...

Regards

I recall a thread posted on another popular audio forum. A ship that sunk during WW2 which had a hugh supply of Western Electric 300Bs was just brought up. This was posted on 4/1.