Gold or Platinum Grade of Tubes for BAT Preamp.

Hi, all. I am awaiting delivery of my BAT VK-33. I’m going to replace the 6 stock EH 6922s with the NOS Rocket Logo 6H23-EB, which is a direct replacement for the 6922. My tube vendor has gold grade or platinum grade (which is about $15 more per tube than the gold grade). Tolerances for matched gold grade are 15-20%, while the platinum tolerances are 10% or less. Given that these are small signal tubes, is the tighter tolerance of the platinium grade worth the $$? Is the BAT hard on tubes, thereby requiring the more expensive ones? Thanks for your help.
@petg60 ... my mistake ... I meant to say that the 6H23-EB is a direct replacement for the 6922. 
@rlb61 worries, 
Happy listening and experimentation.

So what's the story with the NOS Rocket Logo 6H23-EB? I'm curious because there tons of varieties of NOS 6922s and compatibles. There have been many articles and threads about the pros and cons on many of them. I've always had good luck with Amperex Bugle Boys (Holland) and I recall a number of folks raving about Tung Sol 7308s and others lusting for warm Mullards....but the 6H23-EB?
Is that guy @EBM  involved? If so, "jump on them asap". Cheers,
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Voskhods (Rocket logo) made only 6n23p, direct replacement for e88cc6922, and the preferable ones to seek are 1974-1979 period (earlier the better).
The EV version is a different kind of tube, that can stand harder circuit environment, and was made by Reflektor and not so desirable sonically compared to a 6n23p.
I may be wrong but i never came across or seen any Voskhods with the EV designation.
That is my experience with them.