Well, on Mike's review, I picked up 3 of the Groove Tube remakes. Put two in the TAD-150 and one in the TAD-60. Hard to compare as it is like watching a movie for the second time and seeing the parts that you missed the first time but, it appears that I am hearing more meat and bite on the same tracks as I listened to before the change. Sounbdstage remains huge maybe a bit larger but, hard to tell exactly. ext up will be to replace the two AU7s on the TAD-60...