Read review by long time Type 50 tube lover Rob from Netherlands:

Conclusion.
Winners are Grant Fidelity and EML. I would put my money on these. You get new tubes, with warranty. If you like the sound of the old triodes go for Grant Fidelity, if you do favor a bit more modern sound, EML would be your choice. Comparing the Grand Fidelity 50 to the originals, the originals will set you back a heap of money for used pairs, whilst difference in sound will be subtle. You get the same character for far less money, and new. As a runner up I mention the EML’s. They do not exactly match tone and spaciousness like the Grant Fidelities and originals, but do breath about the same character with more tight bass and highs. A bit more “modern” sound. Available new as well. Take your pick.
One thing to mention, the Grant Fidelity type 50 was a one batch production, so only a limited stock is available. No idea how much pairs are left at this time..”

https://www.dhtrob.com/impressies/grantfidelity_50.php