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I have no experience with the Dual 721, (do have a Dual 606, however) so I can not give an accurate comparison between that and the HK T-60. Although I can tell you that I used the T60 with Ito arm for four years and had very good sound with it. I think it's a decent TT but wouldn't pay much more than $300 for one. One change that significantly improved the sound of my T60 was getting rid of the stock rubber mat(this is a must) and replacing it with a carbon fiber TT mat of similar thickness. There's no VTA adjust on the tonearm which was is a downside if you really want to optimize settings for different cartridges, and also, the quartz-lock speed was a bit crude and resulted in audible speed variances--not a recommended setting for more serious listening. The autolift feature at the end of LPs can be defeated to free the tonearm of interferences. There are RCA jacks at the rear to allow changing of interconnects--a nice feature in this older TT as some older TTs are fitted with cheap TT RCA wires. Overall though, it still fell short in about every aspect of sound when compared to the Linn LP12 I currently use.
I currently own both the T-60 and the 721. I prefer the 721 if properly set up and mated to a synergistic cartridge. I'll sell you my T-60 (in great shape and w/Herbies "Way Excellent II" mat - lacks a dustcover) if you're ever interested. I seriously doubt anyone else has ever compared these same models side by side in their own homes (no less recently and on a good system) as I have. Then again, I may not have audiophile ears...