Amateur Radio - Monitor Crystaliner

I've had this 1948 Monitor Crystaliner for a long time.  I've always been wary of it since it was designed with a resistance cord.  The resistance cord (or curtain burner as it is called) has a piece of nichrome wire wound around the hot lead to drop about 100 volts so that the 4 filaments of the 6J5 tubes can be powered in series.  Of course the cord was damaged and was no longer safe.  The man that I got it from just put a rubber tube over the whole cord.  I imagine he used it that way, but I wasn't that daring.

It is a relatively crude instrument but in its way a rather elegant design.

Today I decided to make it operate.  The main filter capacitors had to be replaced.  They were both faulty.  The hard part was replacing the resistance cord with a filament transformer.  I reasoned that the 6J5 tubes would work just as well on 6 volts as on 6.3 volt filament voltage.  There is just enough room to put a transformer on the top part of the chassis.

It was a nice little project for an afternoon.  The Monitor Crystaliner is designed to produce harmonics from its crystals as well as fundamental frequencies.  The original instructions were something I had, but I had to research the schematic.