Sometime in the mid 60's my grandfather, Michael Schonberg, gave me a BC-348 shortwave radio. As a teenager I spent many hours listening to shortwave broadcasts. However, within a few years it developed RF difficulties and I was unable to repair it (mostly because I didn't have a schematic.) I traded it away, but in retrospect probably shouldn't have.
Later in life I able to procure an identical BC-348 on eBay and have had a number of hours recalling memories of my grandfather and shortwave listening. To bring back memories, there's nothing quite like turning the BC-348 on, letting it warm up for a half hour, then opening it up and sensing the smell of hot aluminum, oil, and old electronic components!
Front view
Inside top view
Putting this one in working shape was easy since I obtained the original technical manual with it. It involved cleaning up some wiring, rebuilding a retrofitted preamp chassis, and replacing eighteen 0.01uF 600V caps (some of which were shorted.)
BC-348-P retrofitted 8-ohm audio output schematic
BC-348-P retrofitted 110VAC power supply schematic
I found that the P-version schematic was heretofore unavailable on the web, so here it is, no longer unavailable!
BC-348-P original schematic
