Hi All, I have just about come to the end of my R1155 restoration; haven't used it since the late 8o's I don't know what happened to the original power supply I made for it at the time, probably pinched bits for another project. Anyway, I have made another with negative bias built in as shown on various diagrams,something I didn't concern myself with back then. But there was a massive resistor that was not stock wired in which got very hot, so perhaps that was the bias; wish I had noted where exactly it was wired Ht- to LT- perhaps? Anyway, doing a HT power test through a variac on reaching 100 volts? R4 tuned into toasted smoke. I will have to recheck the wiring on this board, but wondering if this? is a biasing issue?
