I agree with David99, try lowering your VTA and checking the tubes in the phono section of the CAT. Insure that they are NOS. If 12AX7 are used, try 5751. Also, check the load impedance on the input of the phono stage. If it is 47K ohm and your cartridge wants to see 100 ohm, this will certainly add to the bright character. Goodluck.
Help LP playback is lacking
My system is awesome playing cd's but when I play vinyl it sounds bright and lacks bass and lower midrange. I am using a VPI Aries,JM 10 inch arm and Benz Ruby H. The rest of my system is a CAT Ultimate preamp, Wolcott Amps, Dunlavy V's, Jps interconnects and Synergistic reference speaker cables. CD playback is Muse 8 and Muse 296. What's the problem?