Marakanetz's advice is correct.
However, I want to add 1 important aspect: if you are using a MC step-up then make sure that you account for the impedance transformation owing to the xformer: whatever resistor value RCA plugs you make WILL get divided by the square of the turns of the xformer. So, if you are using a 14dB step-up, which is a 5:1 xformer then 100 Ohms effective resistor will be divided by 25. So, on the cartridge side the effective resistor WILL NOT look like 100 Ohms anymore!
So, in the step-up case, if you want the cartridge to see 100 Ohms, you should make 2500 Ohms RCA plugs (1:5 step-up case). Modify if you have any other value step-up.
The cartridge output is 0.4mV & so power developed across the phono load resistor is tiny. A 1/4W resistor is plenty.
Hope that this helps.
However, I want to add 1 important aspect: if you are using a MC step-up then make sure that you account for the impedance transformation owing to the xformer: whatever resistor value RCA plugs you make WILL get divided by the square of the turns of the xformer. So, if you are using a 14dB step-up, which is a 5:1 xformer then 100 Ohms effective resistor will be divided by 25. So, on the cartridge side the effective resistor WILL NOT look like 100 Ohms anymore!
So, in the step-up case, if you want the cartridge to see 100 Ohms, you should make 2500 Ohms RCA plugs (1:5 step-up case). Modify if you have any other value step-up.
The cartridge output is 0.4mV & so power developed across the phono load resistor is tiny. A 1/4W resistor is plenty.
Hope that this helps.