Brimar 13D5 (12AU7).
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>>" i like to dull the sound when listening to bad cds."<<
They will not dull the sound but NOS Mullard tubes will give you a warmer wetter sound. They will knock that harsh, bright, digital glare sound you are getting from your system.
Just my 2 cents, but not sure the word "dull" is what you really mean....
the NOS mullards indeed tame the beast, overtame it in some cases. I put at7s in as driver tubes in my amps (6550s) and everthing rocked. Could have been as much that my power tubes that were also replaced were junk but the at7s still seem pretty lively. Put at7s and ax7s (at $100 ea for the ax7 which were matched) in the preamp and details as to space and instrument seperation popped out everywhere, cymbles sounded great all the rock and roll just up and left. Polite would now describe my system. For some things it's a vast improvement but for others not so much if you just want to bang your head.
My guess is that the mullard ax7s have a little less gain and the matching may add a level of smoothness not present in lesser tubes. Percieved volume level is down which indicates greater smoothness in the highs and mids as well
I just noticed your other similar post looking for a CD player. Why don't you just buy a 10 band equalizer? Then you can tailor the sound of the system to your hearts content? The only thing you might loose sonically by putting an equalizer in your system would be things that your posts suggest have no meaning to you.