We could do with a table creating to be honest on this subject.
If head has a rectifier pcb inside then probably should be looking for 240v ac.
I suspect head is motor only on this so should be looking for dc volts but never had one in so i personally can't tell you.
Ball ache, dc24 25 are 240v ac
dc40 41 are dc - again never bothered checking the dc out. wish i had now.
look in main directory for dc 50, and see if beko1987 has done a strip n build on the model ?