why sound is so different?


Recently I bought a linear tracking turntable with a Shure V-XV type 5 cartridge and a great collection of LPs of the 70s (all almost new, played just once or twice). I've been in the CD world for 20 years and want to taste my youth again. Problem is that now found lots of diferences in the sound, almost all the LPs sound brightless to me, lots of medium frecuencies and lack of highs, and some of the bass is missing also. Dont know if this is normal or must be something wrong in the cartdrige or the phono pream (a new Bellari VP130).
Your comments will be apreciated. Thanks
jorsan
Thanks Madfloyd, you're right about the LPs, there are differences between them. Right now Im listening "full sail" from Loggins & Messina and there are songs where the bass is INCREDIBLE. I had a very good luck because from the guy who sold me the turntable I receive an incredible collection of about 160 records of the 70's / 80's : led zep, boston, fleetwood mac, blood, S&T, etc. etc., music that I used to hear in my youth -Im 50 now- and 70% of this records were played just once, recorded in his Nakamichi and thats all, the complete led zep collection is like new, original pressings and sounds perfect, Im very happy with this and think I found a treasure.
Because of this, decided to go shopping in Ebay, but experience there was totally opposite: first record I bought and first discussion with a seller; the way they classify the records is far from what I think is fair or honest, the idea that they have of "Mint", "NM" or "VG+", differs a lot from mine; maybe Im wrong and because all records are old, and I have to accept that -for example- NM means "used with light marks on the record and some ticks and pops", honestly dont know. Maybe some with more experience with Ebay can help here. By the way, are there some hoenst sellers with good reputation there? if yes, who are they?.
By the way, "pops and clicks" in the LPs bothers me lots less than before, dont know why but its true.
I've purchased a few LP's from ebay and have been very pleased. Haven't had much luck buying from the local flea market. They think they're all rare and worth a ton of $$