Step up from AT150MLX on Technics 1200

It's really hard to upgrade from the AT150MLX without spending a lot more money. The AT440ML is a big step backward. A few reviews have mentioned the 440's upper midrange glare, which is probably due to the plastic body resonance. The 150MLX has a thick, solid aluminum body. The internals may be similar, but the damping and mechanical construction are significantly diffferent.

The 150 and 440 have different generators. The 440 treble glare comes from a rising high end and a cantilever resonance at 16KHz. The resin body is probably less resonant than the metal shell of the deluxe bodied 150. Both need < 200pF capacitance and to cure the 440 treble, load it around 30K or fit it with a 150 stylus.

Dsper,
I think the MP500 is more bass oriented and it might be more like the sound you're looking for. You might want to try a couple of 400K resistors in parallel with your phono input before you spend more money. This will take your input impedance to 42K and make it slightly less bright w/more bass.
The 150MLX is an extremely good value. The other carts you're considering cost twice as much and are just different, not necessarily better IMO. Maybe the money would be better spent on other items in your system?

Regards,

11-16-14: Fleib
The 150 and 440 have different generators. The 440 treble glare comes from a rising high end and a cantilever resonance at 16KHz. ... Both need < 200pF capacitance and to cure the 440 treble, load it around 30K or fit it with a 150 stylus.

You're right about that. The optimum capacitance loading is a very narrow range. I was using a Jolida JD9A phono stage, which is highly configurable. Its capacitance loadings were 0, 47pF, 100 pF, 200, 300, and maybe more. The SL12x0's cable has 100 pF capacitance. I found that the optimum was right in the middle between 100 and 200 pF, at the 47pF setting (+100pF in the cable). 200pF sounded OK but not quite as good to my ears as the 147 total.

I have since switched to an older MAGI Phonomenal all-tube line stage. While the newer version has a 0pF setting, mine starts at 100 pF, meaning a total of 200pF. It sounded OK but was a touch bright, so I added the 1-ohm resistors to my Magneplanar 1.7s and that fixed it. Good thing, because--like its name suggests--this phono stage is phenomenal.

I have the AT 150MLX (which I still cycle in on occasion). I replaced it with the Zu DL 103. I think that the Zu 103 is a fantastic cartridge. Super musical. Very engaging. Well worth the money but still within a 'reasonable' price point.

I would keep the AT150MLX and see if you can try the Nagaoka and Ortofon so you can do a shoot out. Whichever cart wins is the one you keep. Or just keep all 3 and rotate them as all 3 are pretty much state of the art MMs.