Signal tube versus power tube, sound impact?

Manufacturers must spec a tube that is currently manufactured and readily available in bulk. In addition, with the uncertainty surrounding Russia and China trade channels, a European built tube like the JJ is both politically expedient and more reliable. Be thankful manufacturers dont go out and buy up what little remaining NOS tube stocks are in existence. If they did, then there would be multiple threads about greedy manufacturers “stockpiling” all the great tubes and driving the prices through the roof or better yet, company A has 1,000 NOS Mullards on the shelf and won’t sell me two backup quads.

And maybe if the manufacturers did a better job putting better quality tubes in the amplifiers when manufactured the demand on the industry would be to produce better tubes.

Manufacturers spend a lot of money designing their amplifiers and then screw things up by sticking a poor tube seems odd. I'll be curious to know what VAC puts in their amplifiers. I know Conrad Johnson uses NOS tubes for their pre-amplifiers.

Some tough supply chain decisions were made during the pandemic. NOS tubes are going to get harder to source every year. Hopefully CJ has a plan for that inevitability.