Part 5/8:
The collection doesn’t stop at signal generators. Notable are vintage radio receivers like the R390, a robust WWII-era military receiver praised for its durability and sensitivity in receiving VLF (Very Low Frequency) signals. Such devices are known for their ability to pick up unusual energies, including earthquake-related electromagnetic signals.
Additionally, there are sophisticated transceivers like the killer vinyl RF transmitter, which operates at high power levels—potentially 250 to 500 watts—and involves tubes that require repair and calibration. This equipment suggests experimental transmission capabilities, perhaps for research or specialized communication.