Replacing The Stock EH 6SN7 Tubes For Cary SLP 05

I have tried a lot of 6SN7 tubes except Tungsol round plates.
Can't afford them. The best by far I have found is the 1962 nos russian 6HC8 tube from Upscale Audio. Tube is identical to 6SN7's and at $25 per tube must be tried. I have stopped tube rolling my 6SN7's because of this tube

Thanks for the replies. The post truncated before I cpould write my shortlist which is as follows.

After reading numerous online guides (including the reference one on Head Fi) I have a shortlist as follows (with my read impressions in brackets):

1. RCA 5692 Red Base - a long shot as this seems expensive (the best of the RCA's with a warm midrange, wide soundstage, smooth highs which are still somewhat extended, laid back and maybe rolled off)

2. Brimar 6SN7 GT - most likely the black base clear glass as the brown base dark glass one is probably too expensive (warm with a wide soundstage and smooth extended highs but more dynamic than the RCA sound)

3. Tungsol Black Glass Round Plates - again a long shot as it is probably over my budget (the best all rounder with all the above attributes quite balanced out)

4. RCA VT-231 Grey Glass (a poorer cousin of the 5692 red base with similar attributes at a lower price)

5. RCA 6SN7 GTB - (one more notch down in the RCA sound with similar attributes at a lower price)

Your opinions on how these tubes may sound in the Cary SLP 05 vis-a-vis each other is much appreciated especially from those with prior experience with the same equipment.

Thanks

You should try the Pavane 6sn7 in the tube #1 and 3.They made a big different in my Cary SLP 05.

Hi .I made a mistake, it should be tube #1 and 4 .

Based on my experience with 6SN7s in AtmaSphere amps, I would recommend RCA for NOS and Ming Da for new. The Ming Das don't get much press, but they sound quite nice, and look really cool, too.
Does Pavane really make a 6SN7? I thought they were made by Shuguang, and as such, already have a 6SN7 in their Treasure line? Not sure though.