Output Voltage

It shouldn't be, unless your phono amp doesn't have enough gain for the cart you are using.

What phono amp and cart do you have?

I can't tell what 250mv means without knowing how that was measured.

I checked their web site. The MM output of the Creek OBH-15 has a gain of 37db, which is too low for the Dynavector’s 2.5mv output. I think you need about 10db more gain to match well.

How much do you want to spend?

Don't know. I am not familiar with the P-75. However, there is a good chance it will work well with its own cart.

But if you were planning to get a different cart later, you might want to get a phono amp with either a little higher gain or adjustable gains so that you can have more cart selections.

Readster,
Sorry I couldn't give you specific recommendations because I don't have much experiences with the phono amp at this price range. I don't want to tell you something that I do not know well. I can only make suggestions on what to look for in your situation. Sorry for not being more helpful.