Classical vinyl - Good sources of info and talk

I've gotten very interested in classical vinyl in recent months, both new and second-hand. To me, it's generally considerably more pleasant to listen to than CDs. But I've not found a good source for information about it. For example, I'd like to figure out the differences between the Classic Records 180 gm and 200 gm RCA reissues, but I haven't found a good source for information. What recommendations do similarly inclined listeners have? (Audiogon is okay, but there just aren't that many posts on the subject.)

Thanks much