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Best mellow sounding 12ax7 for Thor TA-1000 preamp

I just bought  Thor TA-1000 and am very impressed with the resolution but want it to be more mellow sounding... Darker and less treble emphasis. Can anyone recommend the most musical but mellow/organic 12ax7 for the Thor? When I bought it the unit has telefunkens. The outputs are already mullards so I am focused on the inputs.

It is feeding vtl mb-185 signature amps and quad esl63 with vandersteen 2wq subs.

Thanks!
montaldo
montaldo OP
181 posts
 
Jbrrp1, wish I lived in Minneapolis. It feels like Minneapolis here in St. Louis now. I may try some used mullard 12ax7 as an experiment because right now I need "too warm" to balance the edginess.
schubert
7,386 posts
 
St. Paul is nicer .
jbrrp1
423 posts
 
St. Paul is nicer - - I went to high school there.  I live just across the river from St. Paul, so I really get to enjoy the best of both now!
audiotomb's avatar
audiotomb
1,112 posts
 
NOS Telefunken ECC 83s
and if you really want to break the bank ECC 803 s

Andy at Vintage Tube Services is without a doubt an incredible source, impecebly knowledgeable, the most refined  testing, my highest recommendation.

montaldo OP
181 posts
 
Thanks for all the great advice guys! I tried two NOS Mullards and it helped quite a bit. Then I changed by DAC caps from Dueland back to Audio Note coppers and that helped even more. A cable change or two and I should be good.

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