Another outlier here, I was born in 1946. The Brahms VC is very close to my heart; my parents bought me the D Oistrakh/Konwitschny mono DGG LP in 1960, my second ever LP. I still think the performance is unsurpassed. I have two Grumiaux recordings, but I'm not sure if one is the one you have (there are two later recordings by Grumiaux: Haitink and Colin Davis) ie conducted by van Beinum. If I have it, I'll listen to it intently! Another favourite of mine of the Brahms Concerto is Szeryng/Monteux. I'd dearly like to have the original SB RCA LP, but they seem to go for around £200... And I really must replay the Oistrakh/Klemperer record.I feel like like an outlier in this discussion (born in 1950) but I don't admire recording-quality as my most important criterion. For my money, what gets me is a superior interpretation of a well-known work. Arthur Grumiaux's lesser-known recording of the Brahms Violin Concerto from 1958 with the Concertgebuow leaves every other recording in the dust, including his own later rendition. Periodically it gets re-released. Standards? The orchestra is superb! Grumiaux's architecture, his taste, and intelligence put me on the floor every time! His double-stopping has an indescribable "royal" flavor. The moods and colors the generates are unusually varied. His ending of the work reminds me of the end of a tragic opera. He does all that by sheer timing mastery. I could go on, or did I already?
Hey, it's up on Youtube! (Turn it up.)