The Turn Of The Century Electrotherapy
Physician's Equipment Co Short Wave Diathermy Machine 27000 KC (27 MHz)
(Many thanks to Jim and Graham for this machine)
This power supply was...
...removed from this box to take these photos.
Power transformer, tubes, caps, and coils...
Main coil is Oscillator, side coils couple to this for surgical and pad outputs, vertical coils
couple to this for inductance cable connections
Bottom view. Nice and simple!
"Spark Gap" :)