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Rafael, I have no particular knowledge of the Neo-Classic 300B line stage you asked about.  But after looking at the info provided for it at the Manley site I don't see any technical issues that would arise pairing it with your 509s.

A point to be aware of, though, is that its AC power consumption of 170 watts, in combination with its relatively light weight (shipping weight is indicated as 28 pounds), suggests that it is likely to get fairly hot during use.

Good luck.  Regards,
-- Al
  

Mattmiller 10-29-2017
Hello people you are confusing the MANLEY CHINOOK PHONO pre amp with the Manly labs Jumbo Shrimp line stage (which has a big volume knob on it)!

Matt, what is confused are the specifications in the description of the Jumbo Shrimp at the Manley website, as I indicated in my previous post.  If you look under the "specifications" tab at that link you will see several references to gains of 45 and 60 db, as well as to RIAA accuracy.  Even though, as I pointed out, the Jumbo Shrimp does not contain a phono stage.

The absurdity of those numbers prompted me to take a look at the manual, which correctly states the 11.8 db gain, as I said earlier.
 
No one who has responded here has confused the Jumbo Shrimp with the Chinook phono stage.  That should have been clear upon careful reading of my earlier post.

Regards,
-- Al

George, I'm pretty certain that the 45 db and 60 db gain specs stated in the website description of the Jumbo Shrimp are an error.  They apparently apply to a phono input, which the Jumbo Shrimp doesn't even have.  The manual indicates a very reasonable gain of 11.8 db.  Gains of 45 or 60 db for a line stage would of course be ridiculous.

Best regards,
-- Al