Constant noisy tubes maybe go solid state?

I assume the tubes have not always had issues?  Did anything change in your environment lately?  Thuderstorm?  Electrical work?  High or low voltage?  AC socket grounding issues.
Many things can cause this.  Take your preamp to a different room, or better yet to your dealer, hook it up and see if it is a hardware problem or enivormental. Process of elimination will nail it down.

Tubes are funky devices and as soon as they are powered up they start wearing themselves out as mentioned by a well known audio company.
I don't use tubes right now because the new tube stuff sounds too much like good solid state and I sure wouldn't use tubes in a surround sound application.
If you do use tubes the most important thing is who you source them from but I still look forward to buying a tube preamp again for the use in my two channel stereo.

I have had tube phono preamps, main preamps and main amps for about 3 years totaling 9 models.  I progressively have had a quieter system with simply faint white noise audible from the speakers in the earlier models.  As I have reached my current higher end models, the noise is gone.  This was one of the benefits mentioned for my ARC gear both from individuals and official reviews.  

When I had some output tubes going out I also had a little of this similar noise increasing.  It was a bit inconsistent during this event where I would hear a faint whoosh sound.

It sounds like an odd run of bad luck you have had and makes me wonder if there is an issue with your gear.  Have you ever considered having the tubes tested?  I live in Memphis and The Tube Depot normally tests preamp tubes for $2 each.  I actually talked to them yesterday and their tester can even estimate remaining life.  They have stopped receiving tubes due to the damn virus, but hope to resume soon.  Whether them or any of the other companies out there...it would be good info to have.

Tube sound is glorious....don't give up!!

@dhite71

Does a faint white noise degrade the sound somehow particularly if its barely audible without putting your ear to the driver? 

+1 for Vintage Tube Services !!!