Is this why my analog rig isn't so hot?

Interesting thread. I have one of these .8 mV Gliders on my Vector tonearm. I am loading it at 250 Ohms using my Rhea tube phono stage and I don't notice any loss on top. Matter of fact it sounds pretty damn good. I really don't get the comment about it not tracking well. I have a few significantly warped LP's and it plays them beautifully. I'm sure there are cartridges that may sound/track better but I would not be quick to blame the cartridge or tubes over this issue. Echoing Newbee, I suggest NGeorge calculate resistor values that will incrementally give 100 to 500 Ohms or more resistance when placed in parallel with the Cube and try them before spending alot of money on another cartridge.

Dear george: I don't want to miss the point: try to help you.
I think that you don't have to change your tonearm or electronics, the best you can do is to buy the Myabi cartridge that mates perfectly with what you have and is and exellent performer too.
In this way you will be near the top of analog music reproduction.
Regards and enjoy the music.
Raul.

Note: Sean I respect your point about the DL 103. Like many issues on music reproduction many things are a subjective ones ( like this ) and maybe your music standards are that of the DL 103 and the difference in our point of view is that my music standards are differents from yours.

Hi Raul,
Thanks for helping George with your experience. Good to know his Benz and RS-A1 are (or should be) capable performers.

I totally agree he should check/test all setup parameters (especially VTF and VTA) and certainly try higher loading before buying a new component.

I'm also not sure why you say tube electronics have a top end problem. Mine certainly don't. Obviously one needs to use the right tubes and load/match things properly. But judging by my system and others I've heard, tubes per se are unlikely to be the problem.

Doug, thanks for reaffirming that tubes are OK - I was about to sell my SP10. :-) Strange stuff shows up here from time to time.

Newbee,
I was wrong, but it's your lucky day. I've got a Phase Linear 4000 in the basement. Wanna swap? ;-)