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Manufacturer: McIntosh Electrical Corporation, Chicago.
The Hogan #8870 Brevatherm is recommended for medical and minor surgical diathermy. The unit is mounted in a polished wood cabinet which provides storage space in the lower portion. The cabinet size is 44 inches high, 22 inches wide and 16⅛ inches deep. The weight of the complete unit is 127 pounds.
The wavelength is 12 meters, the frequency 25 megacycles, the oscillator circuit two tubes, tuned grid, tuned plate, push-pull, the plate supply a full wave rectified current. The tubes consist of two 866-A rectifier and two HF-175 oscillator tubes. Three pairs of outlets are marked as follows: "Diathermy and Surgery," "Air-Spaced," "Cable." The diathermy outlets are used for pad technics and minor surgery. Inductive coupling is used for pads and air-spaced electrodes, capacitative coupling for the cable.
The power and oscillatory plant is enclosed in metal; the firm claims that this feature decreases
HOGAN #8870 BREVATHERM ACCEPTABLE. JAMA. 1940;115(5):385. doi:10.1001/jama.1940.72810310026010a