Hunts crb checker

[Mike76]

With the rectifier as a regulator I meant. Also would a full wave bridge be better, assuming that at the time cost might have been the reason to choose a half wave type with a single metal rectifier. If anyone has any ideas what value capacitor is used for the c1 position, the one on the notes marked B with no value given. An embarrassingly simple question I have is, which way round the 1uf smoothing capacitor goes.
Thanks again,

Mike