But in this case all is fine...
Your cartridge body is effectively the same as the AT120E, AT440MLA and AT150MLX... all of which are current models and you can look up the reviews on these cartridges...
Being 1/2" mount their VTF requirements (tracking force) vary, where a p-mount is fixed at 1/25g - however the SL-Q300 does have the ability to vary the VTF from 1g to 1.5g I believe - you should check this! - the counterweight should have an adjustment with a scale showing 1 to 1.5 - this scale is only accurate if you are using a stylus designed for the p-mount, the 1/2" styli are a bit heavier, (around 0.2g) and ideally you should get a VTF scale/gauge to check the adjustment.
There are other period styli from earlier models that were replaced by the current ones too...
So 1/2" mount styli:http://www.turntableneedles.com/search. ... &search=GO
"true" p-mount styli:http://www.turntableneedles.com/search. ... &search=GO
Remember the cartridge bodies are to all intents and purposes identical differences between the bodies are very subtle - differences between the styli are not so subtle, much more evident and audible - you can take your cartridge all the way from a very basic 212-D6C at $22(don't do it, the VTF is actually inappropriate for a p-mount setup! - it will never track correctly!) - to the wonderful ATN152LP $190.
In between, the ATN140LC $90 is the earlier version replaced by the current ATN440MLA $130, - it is excellent and a great buy.
At $40 the ATN132EP is excellent http://www.turntableneedles.com/Needle- ... p_954.html
Nice TT, and a good cartridge - just get a good stylus and you will be in business
bye for now