Leaving tube amps on.

You really are best taking your advice from the Manufacturer.

Why!!!

When the worse that can happen, does happen, the Home Insurers' will be gathering their info to decide on Payout from that very place.

Output Valve Red Plating is able to occur in an instance.

The following is a Guidance from an individual much more experienced than myself:

Red plating is always a BAD sign and if you ever see it, turn your amplifier off immediately.

If a valve suffers from this overheating for more than a minute or so you should probably consider it written off.

I suggest being present as much of the time the Valves are in service, as this will enable you to turn the Valves of in an Instance.

Those beautiful glowing tubes are not visible for the ambience they can create only.

They are visible to allow heat to not collect in a case, and enable eyes on the prize, when it comes to witnessing changes in their operation that can cause a fire.

Mollycoddling tube amps is silly to me. Although I maybe shouldn’t make a guitar amp analogy in this hallowed audiophile ground (I use tubes for hifi also, but firmly believe nothing is sacred), I’ve owned tube guitar amps that were turned on and off frequently for decades...worked perfectly...same tubes for years and years in some cases. You take your hifi tube amp on airplanes? Blast it on high gain in a club then toss it in your trunk? For years? I don’t drag any of my hifi gear around as...well...nobody does except to audio shows maybe...still...and the answer is turn the damn tube amp off. Tubes warm up in seconds...

@pindac Thank you for your response. But what is Valve red plating ? I never heard of it. 

@wolf_garcia 

Ha.

Love it! People can get a bit precious about tubes.

There was a time, when everything ran off tubes…

First thing I turn on when I wake up, is the system. Last thing I turn off, is the system. Listen before I leave for work, listen when I get home.

If I leave the house, I turn it off. If I’m going to be working on something around the house for anything over an hour, I turn it off. I listen to radio a lot…

I have a couple of systems here that I switch out (tube and SS pre amps, tube and SS power amps.) with different speakers. I tend to treat SS and Tubes the same.

Turn on if I’m there, turn off if I’m going away.

I have a friend who bought a SE EL34 amp off AliExpress. He never turned it off. It sat in a small area on a shelf, with poor ventilation. One speaker cable had come undone from the banana plug, so left channel was not connected to a speaker. Tubes were original and of very low quality. Nothing bad happened…

I have not owned high-powered tube amps.  None of the amps I’ve owned really required much warm up.  I turn them on and start listening immediately.  If they seem a bit off, that goes away in a minute or so.  If the sound is enjoyable right from the start, even if it is less than optimal, why would you not start listening immediately?  If you sessions are short, it is even more imperative to start immediately.