My site "Wondering What to Choose" is at:

http://www.sffog.com/wwtc/wonderingwhattochoose.htm

I have collected most circulating gd sources and a couple years ago started listening to them in order from 1965 and am up to 1975 at this writing. I have compared the sources for a date and indicated which sources I think are the best based on sound quality and digital flaws. I also provide a sound quality rating for the chosen sources.