I disagree. There is something special about tubes from Audio Research. they not only take the time and expense to got though many tubes to correctly match tubes and make sure they are within the specifications and tolerances that Audio Research demands, but, they also will repair any device that is damaged due to their supplied tubes failing.
Not many tube suppliers will do that.
I do say that Audio Research supplied tubes are way more expensive.
for my mono power amps, I will not purchase tubes from anywhere but Audio Research in the future. I thought I would save money by purchasing from a very well known tube supplier in California, They stated that the tubes were matched and within specifications for my amps and after installing the tubes and adjusting the bias as directed. a Tube failed spectacularly (I was watching), and it took up some additional circuitry within the amp. not just a resistor or two. lots more.
I don't want to get into a debate as to whether it was a design flaw. It wasn't.
The authorized Audio Research repair service I took them to for repair told me to never purchase tubes from that company because they do not fall within the Audio Research required specifications. They actually tested all the tubes and measured them and also ordered and measured the new tubes from Audio Research and they were correct. The tubes from the other tube supplier weren't close to the required Audio Research specs. Even though they were delivered with a statement saying they were.
Expensive lesson for me.
Most companies are severely impacted by this pandemic. Try to order or purchase a bike now. Since most (not all) bikes are made in Taiwan or China, there is a serious backlog on orders.
Since many American manufacturers decided they wanted to save money (or be competitive in prices), take your pick, by outsourcing construction and labor in Taiwan or China, this is what happens when that supply chain fails.
Hopefully, most of the companies and more importantly the people will recover when this is passed. many won't.
enjoy