Lets look at a few cartridges.
Pickering V15-AT2 AKA Pickering grey. The most common magnetic
used in add on and built in TT's in the 70's.
Tracking 2-5 G
Output 4.4 mv
resp 20-20K
Tetra is almost imposable to nail down due to shear numbers
BUT outputs start at 100 mv & go over 300. Most are custom built for specific models, not for general add on TT's.
SO a ceramic has 20 times MORE ++ than mags. Thats why it has to have a switch, most likely on the back to make it work right.
73 Zeno
LFOD !