This is hard to generalize since each system responds differently towards tube rolling. I am a Raven Blackhawk owner and have found the row one seems to respond the most and row 3 the least to tube changes. In my system I have found that Row 1 impacts clarity, dynamics, detail. Row 2 soundstage, overall sound warmth/brightness Row 3 overall tone and some dynamics, seems to impact feeling for a lack of better words.
Below is a past posting on a prior Raven thread….
If you want absolute sonic bliss get an old stock quad of RCA 6L6GC black plates. Raven Dave’s Shuguang 6L6GC coke bottle sound really nice but the RCA’s wow! Dave offers an amazing choice of fantastic tubes that he can get quantities on but their are some really nice ones he just can’t get to offer the Raven family. After quite a bit of rolling these are the tubes that work well with my Blackhawk in my system.
6L6GC output tubes: 1- RCA black plate 50’s- 60’s bottom getter, 2- Shuguang 60’s coke bottle 3- Svetlana original winged C’s
Row 1: Detailed Dynamic tube 1- Tungsram 70’s with silver square getter supports, 2- Matsushita 60’s-70’s with 45 degree angled getter, 3- Telefunken early 50’s made
Row 2: Warm full sounding midrange tube 1- Mullard 50’s square getter with 3 plate holes... another wow 2- Brimar 13D9 (Note: I don’t own Brimar 6006 yellow T’s)
3- Amperex ‘50’s foil getter
Row 3: Warmer full soundstage tube 1- Westinghouse 60’s Long Carbon Plate square getter on copper post 2- Rca 50’s-60’s 5963 (or 12au7) long black plates and 5814A 50’s triple mica black plate, 3- Raytheon 5814A (12au7) black plate, triple mica with square getter.