Conrad Johnson PV-7 phono stage any good?

I just acquired a very nice CJ PV-7 preamp. It sounds really nice, but I am a little confused about the phono stage. I am using a MM cartridge with an output of 5.2 mV. I need to turn the volume up to about 1-2 o'clock to achieve a normal listening level, which isn't earth shaking by any means. In comparison, my CD player commands only about 10-11 o'clock on the volume knob to reach the same listening level. There is no noise or distortion of any sort when listening to the phono, it just seems a little odd that I need to turn up the volume that much. Will this cause any damage to the preamp? Is this normal for a tube phono stage? Has anyone experienced a similar phenomenon? One other oddity is that the volume knob and listening level were at about the same position (1-2 o'clock) with a 3.0mV and a 5.2mV output cartridge. I thought the higher output cartridge would play a bit louder. Does the preamp have some circuit that makes the phono output the same no matter what the cartridge output is? Will different tubes make a difference. I'm not sure what is in there now, they have no brand, they just say made in west Germany.
Thanks for any help,
The skipper