Taking apart my 52 year old PSU, i've come to notice that some of the carbon composition resistors have maybe absorbed moisture with age and are in need of replacement. However, I was thinking of replacing them with Metal Oxide ones, as most of these are flame-resistant/proof, and more easily obtained. But Carbon Composition I think might deal better with surges… from what I read. What does everybody think?
The PSU can supply about 500V @ 100ma, the HT taps can produce 400v-0v-400v.