Considering 4 12AX7 Tube Types


Hello,
I typically stick with NOS tubes but have decided to try some new production tubes for a change. To be used in a Ming Da tube preamp modded by Response Audio - Vcaps.... Hoping to warm up the mids a bit without making the upper treble harsh, bright. I checked out websites - Doug and Cryoset.

Considering the following
1) Voshod Sunrise 12AX7VKA
2) TAD 7025 WA High Grade
3) Ruby 12AX7AC5 HG
4) Ruby 12AX7AC7 HG

Can anyone comments on their experiences with any of the above tubes?

Thank!!!!!
pdspecl
Sorry,haven't tried them.Another one to consider is Gold Lion.It has the qualities you are looking for and seems to consistently deliver them in many components.My experience has been the mids warm up immediately,the treble is awful and begins to improve at the 20 hour mark.It continues to improve and fully settles in by 50 hours.Best of luck in your search,hopefully someone will post the info. you actually asked for:D
As far as new production goes I agree with gold lion tubes Have you tried any Sylvania 5751 in replacement of 12ax7
As a AVM AUDIO dealer I have tried many 12ax7 in my AVM PA 5.2 pre-amp and have switched to 5751
Good Luck
Dennis
Cheap: JJs - warm and sweet.

old - but awesome: GE 5751 black plate triple mica.