What kind of magnetic cartridge?

[KentTeffeteller]

Originally Posted by jr_tech

If I remember correctly, stereo records became mainstream in 1958.

“1958: Shure introduces the M3D stereo Dynetic Cartridge. It is the world's first moving magnet stereo cartridge and features stereo channel separation at 1,000 Hz of 20 dB or better.”

from: https://service.shure.com/s/article/...language=en_US

jr

Introduced in 1958. launched November, 1957 by Audio Fidelity Records, then owned and founded by Sidney Frey. Not mainstream until 1966-1967. Also Stereo discs were list priced at $5.99-$6.99, usually sold for $1.40 less in most retail stores than list price. Stereo cost $1-$2 extra in general over a mono LP price. Also bear in mind, the list price for a Shure M3D in 1959, $59.99. Which was a lot of money for a cartridge. And worked best in manual turntables, but could be tracked at 4-5 grams for changer use.