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 oddiofyl

For modern production jj ecc83s have a darker tone.  I have a pair of vintage RCA 12ax7a that are very smooth, they have good overall balance, not bright but still have good high frequency extention. ...