"It creates the same characteristic rich overtones" - this 6P1 tube is just a coloration-generating device! What happened to "faithfulness-to-the-source", eh?
The smallest tube amp
This might be the smallest tube amp on the market. Does include a lot of digital things also but interesting concept.
https://www.theverge.com/2021/8/27/22644585/astell-kern-a-ultima-sp2000t-pmp-price-features-triple-a...
https://www.theverge.com/2021/8/27/22644585/astell-kern-a-ultima-sp2000t-pmp-price-features-triple-a...