Tube rolling my preamp with 6922EH


I'm planning on testing the Electro-Harmonix 6922EH's in my preamp, from the stock Sovtek's. Anyone have experience with these or the 6922EHG with Gold Pins? How much improvement can you get with the gold pins?
parapatton
Thanks for all the suggestions. Mechans; you've hit on what I'd like to achieve, which is the most realistic sound with tubes for the biggest bang for the buck.
Would love some of those recommened rare NOS, but want to keep things as affordable as possible. Therefore, for consideration my next question becomes, if you wanted to go a step up from the 6922EH to most affordable NOS today, what choices are there that some of you may have discovered?
How much are you willing to spend?
NOS tubes are definitely the way to go but they are pricey.
Before you venture off into NOS tubes, which addmittedly can be better in many applications, try some of the alternative new production 6922/6dj8's, and see what you think of them. Try the EH, also the JJ, which sound nothing alike, and given your financial considerations and lack of real focus, may just float your boat. If you don't like either of these tubes at least you will have gained another reference when asking for advise, for example my observations of the performance of the EH. BTW the EH is not a 'bad tube' at all. Lots of folks like it!

Caveat 6922/6dj8's that are quiet and worthwhile are usually very expensive. I prefer Amperex BugleBoys, some Siemans, and Tele's. Old Yugo's (EI's) now hard to find, are probably my all around favorite. Be very careful about who you buy from, this is classic swampland territory.
I'm out of the ball park for expensive rare NOS. Would like to keep under a few hundred dollars for all (3) tubes.
Newbee, please tell me more about the Old Yugo's and why you like them so much. What time periods/years were the ones you like manufactured? How would you describe their sound qualities? What weaknesses, if any?
These sites have some good info: ( https://www.tubeworld.com/6922.htm ) (http://www.audiotubes.com/6dj8.htm) (http://home.att.net/~chimeraone/6dj8sound.html) Looks like the tubeworld URL might have to be copied and pasted for some reason.