How low of the cartridge output the Allnic H3000 can handle?


Hi everyone,
I am using the Allnic with the Zyx carts right now, and it sounds wonderfully. Now I am thinking of trying the other cartridge whenever my budget allows. I am thinking of low output Koestu, ... I do not undertand clearly about the impedance matching of the cartridge and the SUT inside the Allnic. 
If we can put the technical thing aside, could someone with experiences with the Allnic 3000, please let me know of which carts you have used successfully with the Allnic please?
Thanks,
Calvin
dangcaonguyen
Thank you all of you who has replied, I really appreciate your amswer.
Now I know that it could be my life time phono stage.
@whart I have changed the rectifier tube to Hytron. It sounds good to me but do yoy have any others to recommend?
Thanks,
Calvin
Calvin- I've never used a Hytron- some look like Sylvania post WWII, others appear to be like Tung-Sol. I'll have to read up. In the meantime, here's a fun piece about the rectifier compiled by someone known as DubStep Girl who listened to a lot of them. I've had several. Right now, using a GEC U52. Her impressions matched mine to the extent I've tried some of the ones she mentioned. 
I’m whart’s evil twin and I use the GEC, too. My second fav is Brimar 5R4GY, then probably Amperex Holland Bugleboy 5AR4.
Yep, @wrm57  have done the same things- I think we both had Steelheads, no? Nice to see you, wrm!
Indeed, we ran with the Steelheads for a few years. Then you helped hook me onto the Allnic maybe 4 years ago. A whole 'nother fish and one that I've never wanted to throw back. So thanks again! Always good to read your helpful posts.