All the tubes that come from reflektor are guilty until proven innocent if you ask me .I would rank some of shuguang's stuff better . reflektor has done some things I think are dirty business.
any big strapping beam tet is a "hifi" tube if you ask me on their characteristics curves they all have high flat curves with a sharp knee .
I look at the 8417 tube as a benchmark for hifi tubes for a variety of reasons . It's curve was as flat as kansas . When looking at 8417 curves you can see it being far closer to an 88 or 6550 compared with an el34 .but now some people claim that a good tube man can make any tube sound like any other , I kinda doubt it.
I say just build for the customer ! don't try and out think him ! You cant win in dealing with musicians they don't even know what they want 99% of em . I don't either that's why I decided to pick up a soldering iron and see what makes it tick so I could change to suit me.