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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

Showing 5 responses by montaldo

montaldo OP
202 posts
 
Thanks for all the great responses. Gjrad mentioned the 5751 as others have. Would a 5751 be warmer on top than perhaps a mullard 12ax7? If so, I would actually welcome less gain/volume
montaldo OP
202 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.
montaldo OP
202 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.

montaldo OP
202 posts
 
Probably not very useful but my mark I serial number is in the 200's. I dont know when the mkII started.

The only switches I could imagine would be either a USB/rca input switch (does it have a USB input?) or a phone mm/mc switch, if the preamp is a ta-2000 with phono.




montaldo OP
202 posts
 
I actually do have a manual I can scan and email if you still.want it. Old thread, I know.
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