The 78 rpm records should only be played using a 3 mil stylus, diamond or sapphire. Nearly all record players up through the mid-60s had a 78 rpm speed selection and flip-over cartridge with the right-sized stylus. Play a 78 with a .7 mil std styles for 33-45 and it sounds awful.
78 rpm records on older players with a crystal cart will sound appropriate considering the state of the art until 1950s. I have repaired post-war vintage radio-record combinations (Philco M6 player and V-M 400 player) at request of customers who know this.
Play them on a 1950s-60s equipment with a ceramic cart and they are not as pleasant but not overly scratchy.
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"When resistors increase in value, they're worthless"
-Dave G
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