Elgar Power Supplies 501A Specs

  * Output Voltage Ranges: 0-32, 0-130, 0-260
  * Output Frequency Range: 45-5,000 Hz.
  * Output Power (VA): 500
  * Input: 115VAC, 47 - 63Hz
  * Dimensions: 7" H x 19" W x 17" D
  * Weight: 100 lbs.

Manual:

http://www.programmablepower.com/products/Discontinued/Downloads/251%20and%20501A%20Operation%20and%20Service%20104-1PH-26%20Rev%20Oct%201983.pdf

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