M77 phonograph cartridge for Rowe-Ami jukebox

M77 phonograph cartridge for Rowe-Ami jukebox

Date Updated: August 30, 2019 FAQ #474
Question:
Hi! I'm working on restoring an old 1950's, or 1960's era Rowe-Ami jukebox.Inside, is a Shure cartridge model #M77-DA. Stamped on top are the letters"ED". There are no screw holes, but there are two pole snaps, one on each side.The top is red, & the bottom is black. ------ pin1 | *L | pin2 | R* | pin3 | *LG| pin4 |RG* | ------ *-designates pin locationThis is a backview- UNATTACHED, are 2 red wires, & 2 black wires(ground ?).
Answer:

Typically, the red wires will connect to L and R (Left channel hot and Right channel hot). The black wires typically connect to LG and RG (Left channel ground and Right channel ground). However, it seems odd that Rowe would not use different colors for the Left and Right connections.

Experiment with different hookups as you will not damage the phono cartridge if you hook it up incorrectly.

Shure no longer sells the M77. It tracked at 3 to 6 grams and had a spherical stylus with a radius of 0.7 mils.