I'd give 6n6p tube a try. I use them in my BAT preamp with excellent result.
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The 6h30 dr's seem to have a bigger impact(improvement)when used in preamps as oppose to amps. Personally,they were a big improvement in my LS-25 mkII as well as my friend's LS-26. They have a life expectancy of 10,000 hrs.
I had the exact opposite experience as Dgarretson. My 5yr. old Bat 6h30dr's sounded much better than a brand new pair of EH 6h30pi goldpins.
The only way you'll know for sure is to try them yourself in your system but at the price they're going for now, it is an expensive endeavor.
The NOS 6H30DR tube has been discussed at some length, but different people come to different conclusions. Some find no difference, some find a slight but insignificant difference, and some find a very important difference. So system and personal preference prevail.
Doesn't the VK75SE take only a single pair of these? I would recommend you give them a shot. I would also recommend the EAT Tube Dampers, regardless of which 6H30 tube you pick. Although the 6H30 is not terribly microphonic, microphonics are never a good thing.
I am with dgarretson here and Eee3. I ran VK75SE and then VK150SE's for about 6 years. It's a great amp(s). Had the same experience as dgarretson I suspect this is also system dependent. However my bat vk51se preamp liked the dr's more so than the amps..even the older dr's. Newer EH 6h30s did have more dynamics.
The EH6h30's are a great deal...maybe try a pair of matched (sections and tubes !) in your amps. If you want want spring for the dr's...