First most of the home brew rectifier boards have small 3kv Orange Ceramic Disc caps across each diode I assume as a form of surge protection. I have been looking at OEM rectifier boards and most of them skip the caps across each diode. Now keeping in mind that I will not use this as my sole means of surge protection what is considered "best practice"??? I will have some form of surge protection on the power supply input side to guard against surges from the power company before my 110/120V makes it to the primary side of the transformer.I have not decided which type of components I am going to use for this just yet. So as a back up does it do any good to put caps across each diode? If yes would 222pf 3KV disc caps be sufcient to act as back up surge protection? I have probably 100 of theses collecting dust from a project I did a few years back. If not what level of capacitance would you recommend to act as back up surge protection?