TIC ..sadly I never got a chance to try it on the Quad. I'm sure the differences would have been for the positive. It's improved every player I've tried it on. It doesn't change the tonal balance of the player. What it does do is allow you to hear the player without a load on the outputs.
It's like unleashing what's there to begin with.
Also I wanted to add that the Super Clock 3 should give you a serious jump in performance. You should be able to get this installed for $295.00 .
I remeber looking inside the Quad. It is laid out very well. The mods should take well to your player. I can only imagine what levels it will push this player to. The Clock and power supply upgrades as well as the output upgrades seem to make dvd/cd players sound more analogue, instead of artificial. I see no purpose for tubes in my system now. I know some prefer tubes in cd players and mostly because it washes over that digital sound. But it also washes over the spacial ques and low level information in the recording IMHO. With the clock,power supply and output upgrade. Tube wash over isn't necessary because the Cds aren't harsh or edgy anymore.