Step up transformer recommendation

The AR Reference 3SE has

Gain:

Selectable 51 dB (Low) and 73 dB (High) at 1kHz BAL; 45 dB (Low) and 67 dB (High) at 1kHz SE. (MC and MM compatible).

Input Impedance:

47k Ohms and 100 pF SE. Selectable loads: 1000, 500, 200, 100, 50 Ohms, and Custom.

You would use the 45 dB setting and 47K ohm setting with a Step up transformer.

If it is the  PH3-SE, with a fixed setting of 54 dB of gain, then you would probably want to use a 1:5 or 1:10 step up.

I have the older PH3SE phono preamp 'not the reference'  I added the resistors for the 100 ohms input impedance adjustment.  The system played but at a really low volume, I could hear the music when I turned it up to 70% volume.  

Yes this preamp has a fixed gain of 54dB, probably do want SUT of 1:10?

Should I invest in SUT and use the PH3SE or would money be better spent on a dedicated MC phono preamp?  

I would love to hear what is recommended from others. 

@agrogon 

I would try and see if you can borrow a 1:10 transformer to see if the gain is right.

1:5 transformers are rare.

Have you tried the PH3SE straight in at 47k ?

K&K Audio offer reasonably priced MC step up's using Lundahl transformers.

Tthe basic kit using the LL9206 offers you 14/20/26 db selectable. They will build the kit for you - price is very reasonable. 20db is 1:10, 14db is 1:5 ( I think ).

http://www.kandkaudio.com/moving-coil-phono-step-up-kits/

I have a Slagle 1:5 SUT that I have been using successfully for a similar set up. I’m thinking about going to a different system so I may be selling it.