That’s some good info, thanks. I have been directed to the record label websites when using Google. I should go to the label sites more often, good idea.
I have a couple of Salzburg Festival discs; think I will start Googling them. I also have some live broadcasts on CD. They’re all listenable as historical recordings, although some have better SQ than others. The best quality recordings by radio stations were performances that were to be aired at a later date or were tape-delayed. Most of them were air checks by the stations of live broadcasts and then issued to the public on vinyl or tape. These are lesser quality probably due to slower recording speeds and recording the signal after it had been transmitted. As you know, in those days the goal was to broadcast a live concert to the public, not cut a record.
In any event, many are great performances and that’s what I look for.
When I started buying classical, I was only interested in the best SQ. Then I realised I was missing out on some great performances. I have many mono CDs of the great conductors, such as Furtwängler’s
Bruckner performance for the Nazi elite.
I now prefer listening to early mono performances by Toscanini, Klemperer, et al, rather than their later work.