What's with BAT?

The 60H30 tube BAT is using is the supertube version , there is no better
kind available , this tube last much longer than the standard version .
In my ARC gear all 6H30 tubes have been replaced by the 6H30P-DR 
version , just not only the lifetime , but also more musically 

The Russian 6H30 was actually introduced to the USA by BAT(who has as it’s designer a genuine Russian rocket scientist). The tube is more efficient than the previous 6DJ8/6922, allowing less tubes in circuit, to perform the same job. ie: My VK-D5 uses six 6922s(early sixties, Siemens CCa Grey Shields) vs the VK-D5 SE’s four 6H30s. It’s also an innately quieter design, which makes it attractive for high-gain devices. Nowhere near as many variants/iterations as the manufactured for many decades, by a plethora of providers, with as many sonic signatures, 6DJ8/6922/ECC88/6N23P types.

The Russian 6H30 was actually introduced to the USA by BAT

 New Sensor was sending us samples two years before BAT went into business. Just FWIW.