Instrument Corporation of Florida model R 500 VLF Receiver. Circuit traced by Gerald N. Johnson, then KØCQA, now KØCQ about 1973. Front panel picture, Top view, a little dusty after 40 years of use. Rear view. Name tag. Block diagram. Overall schematic with modifications I made shown in red. Original and modified tuning ranges towards the lower right hand corner of the schematic. Module E 1 and module E 3. All these schematics are in fading pencil on paper and took some photo processing after scanning to get them as visible as they are.

Web page created January 12, 2015.