Tried other brands of 12AX7's in my Crate Vintage Club 5310 '92 in V2 tone-stack position, (modded) and the sound was too agressive. Swapped out with the 12AX7WA and sound is creamy Marshall just right. Treble is very responsive-mids killer at full sweep. good bass as well. Also, using 5751 in V4 so the gain is more manageable. At full out gain & mids full - gets a nasty ZZ Top ol'school Barb-B-Q. La Grange raw drive tone. Good clean tone too. Best tube I've found so far for this amp config. Not noisy at all.
Jax FL USA