The Krohn-Hite Model MT-56 Matching Transformer is an accessory designed to supplement the output capabilities of the Models DCA-10 and 7500 Power Amplifiers. The MT-56 provides matched output impedances for amplifier-to-1oad ratios of 100, 25, 6.25 and 1.56 to 1, selected by the front panel LOAD IMPEDANCE switch. When the MT-56 is used with the Model DCA-10, these ratios correspond to matching loads of 6, 24, 96 and 384 ohms. When the Model 7500 is used, these same ratios correspond to matching loads of 2, 8, 32 and 128 ohms. The MT-56 operates over a frequency range of 30 Hz to 500 kHz in two ranges - 30 Hz to 10 kHz and 10 kHz to 500 kHz - as selected by the front panel FREQUENCY RANGE switch. The MT-56 is available in a rack-mounting version only. Multipurpose binding posts are provided for input and output connections. Detachable grounding straps provide additional floating ground operation.