I am working on a Delmonico PB-741. It's a Japanese (JVC?) copy of German-styled radios of the 50-60's.
As received, the AM band was dead, and there was significant hum on the FM and Shortwave bands, as well on the phono inputs. I was able to get the AM section working again (a break in the coil).
The radio does not have a transformer in the power supply. I have replaced the electrolytics. The humming is very much improved, but is still annoying, especially during quiet passages of music on FM.
I am expecting too much from this radio, or does anyone have any suggestions about what my next steps would be in trying to tame the hum? The radio actually sounds pretty good - it compares well with my Nordmende.
Thanks in advance -