ElectroHarmonix 6SN7. They're ok, but not anything special. QC is ok, but not great - there are better and worse tubes in this brand. They're not too resilient against shock, so you might get some microphonic ones due to shipping.
Slightly edgy sound with plenty of bass. Microdynamics are so-so, but depth is good. "Mario" of tubes, doesn't do much wrong, but doesn't do anything really good either. Burn in of these takes about a week in S7 - they become less edgy and show more depth.
They're a decent preview of what the amp is capable of and just that - a preview. Which is still really good.