RCA Victor records' quality

you might try cleaning them......RCA's sound good, even excellent to me....Mancini's Peter Gun, Bob and Ray Throw a Stereo Spectacular, etc.

Try Roulette or Deutsche Gramaphone, if you want shrill.

You say the LPs are in great shape.  I assume you mean they look good on the surface.  I've purchased many LPs that are 50+ years old and looked like they had never been played.  Only to find they sounded terrible,  Even after Ultra Sonic cleaning.  I think somtimes they are just worn out, even though they look great to the naked eye.  It's a gamble with any LP that old.  IMHO.

@lewm 

That might be newer DGG, but the older stuff is fine to incredible although not quite up there with EMI. I do not have any experience with Roulette. I'm not that old:-)

1+ @bigtwin 

My experience buying used records was awful. I have not purchased a used record for over 20 years and won't even look at them any more. Either I was extremely unlucky or my definition of a satisfactory record is different than others. 

Mijostyn, if you’re buying LPs in the here and now, and if you like Count Basie, Sarah Vaughn, Joe Williams, and etc, you don’t have to be old to buy LPs on the Roulette label. Thankfully, most of those great jazz artists also recorded on other labels, like RCA.