Shrill high frequencies

+1 lalitk

Amp is Luxman MQ-88UC, preamp Audible Illusions Modulus 3b factory upgraded, sources Modwright modified Sony HAP Z1ES,.Magnum Dynalab MB 108 tuner. All IC cables are Cardas Clear , Speaker cables Nordost Frey 2. Speakers are KEF LS 50 or Goldenear Triton 1, subs REL Stentors. 

Magnum Dynalab MD 108 tuner, Modwright modified Sony HAP Z1ES, Audible Illusions Modulus 3A with all factory upgrades, either an Atma-Sphere S-30 mk 3.3 or Luxman MQ-88UC amp KEF LS 50 speakers 2 REL Stentor subs. ICs are all Cardas Clear, speaker cables Nordost Frey 2, power cords Shunyata. 

At your suggestion I changed the power cord from that provided to Shunyata Delta. No joy. Maybe break-in time will help. 

Maybe the Isotek needs more break-in time. 

BTW - I use a MD 108T + KEF LS50 and those 2 are definitely not bright. My Accuphase T-101 tuner is much brighter than the MD 108T