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January 11, 1941


JAMA. 1941;116(2):140-141. doi:10.1001/jama.1941.62820020010012a

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Manufacturer: The Liebel-Flarsheim Company, Cincinnati.

The Dual Wave SW-550 is recommended for medical and minor surgical diathermy. The unit is housed in a metal floor model cabinet. According to the firm, the Model SW-550 provides circuits for generating two wavelengths—one wavelength in the ultra-short wave range (approximately 8 meters), the other in the short wave range (approximately 24 meters).

The short wave circuit (24 meters) and the ultra-short wave circuit (8 meters) are of the tuned-plate, tuned-grid type. With both circuits the patient circuit is inductively coupled to the oscillator; a variable condenser in the patient circuit provides for resonation with the oscillator.

This unit employs two rectifier tubes type 966 and two oscillator tubes type WL-468. The WL-468 tubes carry the following manufacturer's rating:

Physical tests performed in the Council laboratory disclosed that the apparatus has an input of 1,290 watts and an output of 500 watts by the

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