Is it common for tubes to outweigh the cost of the amp or preamp?


I just got my first tube (headphone) amp and was wondering if it is common to spend more on the tubes than the actual cost of the amp. The amp was $599 with stock tubes. I just ordered NOS driver tubes that ran $640 for the pair and the power tube upgrade I'm planning will be another $300. That has the tubes sitting at 1.5 times the cost of the amp itself.

I don't find the total of $1539 for the amp and upgraded tubes unreasonable but considering the next model (amp) up is $1199, it has me wondering what would be better... a lower cost amp with superior tubes or a higher cost amp with stock tubes?
samiamnot
Viva tubes

https://www.vivatubes.com/search.php?search_query=kt88&section=product

Thanks for that link.

Yes even better on some of the equivalent brand, but if your can prove your in the industry and join/login I think you'll find "some" are better from New Sensor. 

Cheers George
I always wondered if Uncle Fester on the Aadams Family could light up a tube like he could with a light bulb by putting it in his mouth. I expect he could but the visual effect would not be as apparent. sigh
Ahhh....one of the beauties of owning tube gear is upgrading or rolling in new tubes. Enjoy the adventure!!

I own a variety of tubed audio equipment: AI Modulus 2B, Modulus 3A and Modulus 3B, BAT VK50, Juicy Music BlackBerry Extreme, Hurricane amps, a Response Audio-modded Ming Da preamp and personally hand-rebuilt Dyna
ST-70’s and Dyna MkIII mono’s. All have suffered the tube rolling endeavor. Lol