Back in the days before the manufacturers deleted the phono preamp and people were all in on CDs, etc, not a lot of attention was given to the phono stage unless they had a cartridge that needed special care & feeding (or, you talked to someone at a high-end audio store and in that case, anything they didn't sell was crap). At that time, it was hard to find a phono section that wasn't decent even in mid-priced equipment and most MC preamps were able to provide enough gain unless it was a special case, like the Denon 103d, which is what I still use. The output is ridiculously low and some preamps don't provide enough gain to allow using it and returning to a different source without being blown out of the room. If you decide to buy an MC cart and use it with your P6, you're welcome- I spoke with Richard Schramm about the gain in the P5 being lower than the Sony integrated amps I had and have, so they seem to have had enough requests to add another 10dB.
In the old days, nobody cared if their phono preamp was special and that's the way we liked it!
Get off my lawn!