I spoke today with Victor Komenko of BAT about this. He mentioned that they are almost out of stock of the NOS 6H30s and would shortly be converting to new production. He stated that his NOS versions are also available in the general market, and are designated 6H30PI-DR. He also mentioned that there is some junk out there to be avoided. He is unaware of the gold-grid version-- his versions have white grids. I can report that the Sovtek -EB version I acquired from Tubestore.com for my VK75SE sounds fine. So there it is.
Dave