If you aren't familiar with this machine, it has 1 tone arm that goes high or low to play each side of the record with a cartridge on the top and the bottom.
It uses two 51-1 cartridges. Much to my surprise, the two cartridges are wired in series. I'm planning on putting 2 new carts on it and wondering if I should put them in series or parallel. I'm surprised it works with two in series, being that they are ceramic. I forgot to look to see what the input resistor is and it's value is not on the schematic.
I forgot to mention that the top and bottom cartridges are NOT wired to a switch to get a signal from only one cart at a time like Wurlitzer did.
It's not the end of the world if my first attempt might not work well, but the reason behind this is boggling to me. I'll be using the Crosley cartridges as nice fitting replacements and will connect their (stereo) outputs parallel like I normally do.
Not that it matters, but the machine is set to play 45's and it will stay that way.