Can I use a step up transformer?

I don't think you need to spend that much to get results. .check out Bob's device but before you do that i notice that you are using a McIntosh power amplifier. .i had a 7270 for a few years likedit a lot. Mine had a switch on the back to increase the gain.not sure if your model dose but if it is the case perhaps try that and see what results you get.best of luck.

Hello.
K&K audio sales Lundahl transformers.
They have a kit that can be upgraded to their silver transformers. 
I have one and a friend has one.
I don't think you will find anything that sounds better at any price. 
But the cost is just over 1500.00
This is the best audio purchase around. 

Dear Nandric,
25 is enough :-)
or?

Dear Thuchan, How could I know; I own  only two?

You can certainly try a step-up but in my experience they color the sound too much and lose the low end. I've had Sony, Denon (2 kinds, they where the best IMHO), Dynavector, & Fidelity Research, they were great investments, I sold them all for more than I paid so I've not heard everything but I just find a well designed solid state phono preamp much more transparent. I use a Monolithic PS-1 with the PA-1 upgrade power supply, $1100 new with my Dynavector 17D Karat and Grace Ruby FE9+. I've heard better RIAA preamps but only over $4k. I'd love to try a tube preamp but too much money for me right now.