Who is your favorite tube seller?

I have had excellent results on ebay with many sellers but you have to be experienced, know your tubes and have a tube tester. Incredible deals can be had if you really know your tubes and spend time searching.If you are not experienced then Brent Jessee for used and Psvane for new would be my choices.  
The worst tube experience I have had was with VIVA TUBES.  They sold tubes they claimed were NOS with great test values.  When they arrived they were old, appeared heavily used and tested awful.  They did give me a full refund since I used ebay.  

Brent Jesse has been my go to lately.  He probably has one of the best NOS offering these days.  Upscale and Tube Depot are also good.  I’ve used Viva several times and only had to return once.  But they took them back and refunded me in full right away.  Anyone that has used tubes for a while understands you can get a bad tube from anyone, notwithstanding the testing they say they do.  I just got some new Summit tubes from PsVane and one went noisy after a week. And their new Summit line is suppose to be their best.  They are replacing them though no questions asked so again just goes to show you can get a bad tube from anyone at any time.

Tonal Tubes

Viva

Tube Depot

Ness Tone

Have only used two vendors and very satisfied with both:

1. Upscale Audio
2. Tube Depot

Rich 

Vintage Tube Services -  Andy Bouwman.

Upscale Audio.