Kevziek, a few years back, an amplifier manufacturer friend of mine bought tubes direct from Russia. These retailed for about $18.00 at that time. He and others in my audio group joined orders and bought 300 of them for about $3.00 each. I assume the guy in Russia that was our contact made something for his effort.
The five to one markup is usually on parts, and I did not mean to say that EVERY audio component has that markup. Remember that the manufacturer has to make a profit after designing the gear, ordering, sorting and testing the parts, then must advertise and support the dealers and customers and have staff to do warranty.
This is all very expensive, as we are talking about human time and effort. The cost of the materials may well be 5 to 1 or even greater, but that does not take into consideration the other factors.
I think because tubes are somewhat fragile, prone to failure with expectation of total replacement (not pro rated like tires) the markup is kept high to build in a bulletproof profit base. I wish some of the profit was spent to produce the premium tubes that we discussed.
As for the direct question about the Cary V-12, I have zero experience with it, but have heard from reliable sources that it is a very good amp. My tests of various EL 34 tubes in the Tube Research, Sound Valves, and Wolcott all prove the Tesla E34 L to be a great tube for the money. It is new production like the Russian and Chinese tubes and is probably not better reliability wise, although I do like it's sonic signature.
Of course the Mullard is what sounds best in each of these, especially in the high end gear like the Tube Research and Wolcott. They even beat up on my supply of Telefunken EL34's.
My posts were not meant to say that new production tubes were of no value, not even to say that they were not good. The discussion somehow turned to where I felt I had to justify the quality of NOS, something that seldom ever needs be said at this site.