How much difference will a phono stage upgrade make?


For the past couple of years I’ve slowly been upgrading my audio equipment. I currently have a Primaluna Dialogue Premium HP integrated amplifier, an EAT C-Sharp TT with an Ortofon Quintet Black MC cartridge, and Tannoy Revolution XT 8F speakers. The weak link at this point, it would seem, is my phono stage, which is a Pro-Ject Tube Box DS. All things considered, my system sounds really good to my ears, but I can’t help but wonder what a phono stage upgrade would bring to the table. I’m looking at the Manley Chinook Special Edition MK II, which is a big step up in terms of cost, but I wonder how much better it will actually sound. Has anybody made a similar upgrade, and was there a marked uptick in sound quality?
12hz
By the way, I don't think Chinook is over the top for your setup.  The Primaluna and the Chinook are a fantastic match, and will support what you have as well as many future upgrades.  IMO, with these two components, you have a long term system.  Tweak tubes or cables, change speakers or turntable, but keep these two components.  They are a good team!
I have both the Manley Chinook and the EAR 834P. FWIW, here are my impressions.
Both are excellent overall. I prefer the Chinook with MM cartridges, and the EAR with low output cartridges. Maybe it’s because the EAR has step ups for mc.  With the Chinook I alway use an outboard step-up for mc cartridges.
I have both the Manley Chinook and the EAR 834P. FWIW, here are my impressions.
Both are excellent overall. I prefer the Chinook with MM cartridges, and the EAR with low output cartridges. Maybe it’s because the EAR has step ups for mc.  With the Chinook I alway use an outboard step-up for mc cartridges.
Back in the day I was blown away by the legendary Magnepan Tympani IVa , when the dealer insisted on showing me the ARC SP8 (phono/pre). The phono made more difference than the best speaker made !!! 

So yes - get the best phono you can stretch to afford and keep it forever. My opinion.
Regarding cwb3rd’s post about Keith Herron above: your customer service from Keith is not unique. I have experienced the same level of above-and-beyond service from him over the years. It started the very first day that I received the VTPH2 (now upgraded to 2A). It was 10 pm, I was trying to connect it to my integrated amp, and having problems. I emailed Keith, expecting to have to wait until at least the next day to get his reply and hear my new preamp. Moments later, he called me and very patiently helped me figure out the problem and walked me through the setup. That was just the first of many times he has provided similarly great service (and NO-that does not mean I’ve had problems with the VTPH, just that I have had many questions and requests as my other components and cartridges have changed, and I’ve upgraded it). This is just how Keith is. One of the true gentlemen (and most definitely a “scholar”—he knows his engineering and music) in the hi fi business.  To be clear: I don’t have any connection to him other than being a happy customer. The VTPH2A is a fantastic piece. I will never sell it! Best of luck to you.