Here's the schematic. Click on the green "eyeball" to open.
http://www.nostalgiaair.org/PagesByM...7/M0029907.pdf
This converter robs B+ from the radio set that it's used with. You could use an electrolytic to replace the 2mfd @ 400V: could use 5 mfd. @ 450 V for a little better filtering. Then there are a handful of other caps. The connections: long wire antenna to Ant, set B+ to Gnd, Output to set's antenna terminal. When the converter is switched off, the switch on the converter connects the long wire antenna directly to the set's antenna terminal, bypassing the converter. You'd need to devise a better plug/socket arrangement for the B+ to avoid exposed high voltage.
Read the first page of instructions carefully, noting all the caveats about how to connect the B+.