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 1 response by audiotomb

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.