Russian Tubes or Old "American" Tubes (built where ever)?


Currently I have Aperex ECC88 tubes in a CJ 17 LS pre-amp and a backup set of Russian electro-harmonix 6922EH tubes for the pre-amp. The Aperex tubes are failing. The amps are solid state Mac 601's

What type of tubes (manufacturers/time period) would you guys recommend? Are the Russian tubes any good? Buying legacy tubes from 50 years ago gets expensive. I'm looking for a great price/performance ratio, but I lean toward performance. Do the Russian Tubes compete with the old tubes or should I "bite the bullet"?

I know folks can get passionate about this - I'm not an idiot; I would like to hear some experienced opinions about the relative merit of various tubes for this particular pre-amp. I'll then go check my budget (in secret - I'm married).

Thanks.
Ag insider logo xs@2xnab2
P.S.  I forgot to mention to do a search for "Joe's Tube Lore". 
He has done a rather extensive shootout of several different tube families. 
His results are a good read and a good starting point. 
Remember, your results will/may vary from his. But Hey, isn't that what makes this hobby fun?
Many NOS tubes are very good, but the can get pretty pricey. At least you are only looking for a pair, which helps a lot. The NOS market can be scary and dangerous if you don't know what you are doing. Pricey, but some shady re-sellers out there.

For new tubes, I have found the Psvane tubes to offer very good quality at reasonable prices. Of course, as always, YMMV.

Thanks for the responses. I’d love to have more suggestions and reputable sources for tubes and thoughts about the quality of the Russian/modern tubes vs NOS tubes. I’ve had the pre for quite awhile (and I still have a couple of others including SS CJ) and have generally used older tubes.

Let me clarify: My plan is to buy some tubes in addition to the spare ones I have. I was hoping to get some feedback from folks about the tubes that they have used (particularly if they have used them in the CJ) so that I could cut my selection down and save money in my process of evaluating a few sets of tubes. The pre-amp actually takes 4 tubes (not 2) so depending upon the tubes selected it can get pricey. Particularly if I follow the "test a bunch of tubes in your system and pick the one that sounds the best to you" approach.

 General observation: I think we would all agree that a particular brand and/or set of tubes would sound best in my system and in my room, but I don’t have the time and/or money to try every combination to achieve that goal (I’d be potentially more cost efficient by going out and spending the money on a different pre-amp). If our advice becomes “trust your ears, in your room, with your equipment” although it is an accurate assessment we then lose the benefit of the community and reviews and comments become irrelevant. That’s part of what a forum is designed to do: share experience and wisdom across audiophiles.

Personal experience: I know I can sell the tubes used. I always intend to sell my old equipment, but I have observed that I tend to keep it (with the exception of the really pricey stuff and then I price it to sell before my wife goes insane).

 So again – thanks for the advice, more is welcome; after 45 years of tinkering I still have lots to learn.

PS
What's YMMV?
Joe's even more anal than I am and must be single and rich (thanks for the reference)!