Rega P8 with Alpheta 2?

The output is .035 mv! 
https://www.needledoctor.com/Rega-Apheta-2-Phono-Cartridge

Here ya go!
The Apheta 2 is the perfect partner for the RP8 and RP10 turntables which can be supplied factory fitted at a discounted package rate if requested. Please ask your retailer for details.A Unique DesignConventional MC cartridges utilize a steel suspension system (tie wire) which creates a high amplitude H.F. resonance (normally around 8-12kHz). Such resonance is unacceptable and is usually damped by a rudimentary piece of foam rubber.

However, the foam rubber deteriorates with age and cannot prevent the complete structure from vibrating and "ringing".

The specifics and adjustment of the tie wire and damping determine whether the cartridge is under damped (bright) or over damped (warm and bass heavy), a happy medium is rarely achieved.

This encouraged Rega to pursue a new direction inspired by modern materials and the basic laws of magnetism. The Apheta 2 contains neither a tie wire nor a foam damper.

Moving coil aficionados will all recognize the long search for super clear, high frequency combined with firm, tight bass. Features:

Iron cross & coil assembly 50% smaller than the original Apheta

One of the worlds smallest MC generator

Cutting edge neodymium magnet

Vital profile nude diamond stylus

High specification fine wire

Technical Data:

Tracking Pressure 1.75 - 2.00g

Input load impedance 100 ohms

Output impedance 10 ohms

Nominal output voltage 350μV

Channel Balance : ≥ 20μV

Separation : ≥ -29dB

Do you know the input sensitivity of your preamp? This should help!
http://www.kabusa.com/pregain.htm