You encouraged me to pull out Bruno Walter conducting Mahler 9 with the Columbia Symphony. This is a box set I've owned for around 60 years. While the performance and sound quality are superb for the era, my copies have very bad surface noise, especially Record 1 which contains the first and last movement. Designed for autochangers, Record 1 gets put back in its sleeve twice as often as Record 2. The sleeves were paper with a plastic lining, replaced with anti-static sleeves after an ultrasonic clean. As a box set, the records were much freer to slide around inside than records in normal record sleeves. This surface noise is not the snaps, crackles and pops I associate with static - more a subterranean murmuring or leaves rustling.
Before my DS Audio cartridge arrives, I will ultrasonically clean these records again, and then listen to see how much noise the optical cartridge transmits.
I have a couple of SACDs of Mahler 9 - the Osmo Vanska BIS recording A$30 and Gergiev's complete set with LSO live which costs about A$60 for 10 SACDs. The Walter / Columbia set is still available on CD for about $30. All these disks added together cost less than one Achromat here.
PS: Did your post unpacking my joke about STIFF DUNG get censored?

