Check the listing for details. High Power Amplifier 50W 45Hz-100kHz TESTED! Transformer coupled out 0.05% Dist. Condition: Used. Listed at 650.00 USD. INPUT, Single ended IMPEDANCE . 11,000 to 25,000 ohms GAIN, Voltage, adjustable. 0 to 10 OUTPUT, Ground or Floating (PA 50T only) POWER, RMS, Direct coupled, DC to 20,000 Hertz, @ nominal line voltage (—20% @ DC) . . 50 VA ±10% Transformer coupled, 40 to 20,000 Hertz .45VA±10% VOLTAGE RANGE, Direct coupled, no load . 0 to 15 VRMS Transformer coupled, no load, 3 taps.0 to 37V, 0 to 75V, or 0 to 150 VRMS MATCHED LOAD IMPEDANCE, Direct coupled . 2 ohms Transformer coupled. 13 ohms, 50 ohms, or 200 ohms GAIN INSTABILITY .0.01% REGULATION, LINE, 10% variation . within 0.01% LOAD, No load to full load (adjustable on xfmr coupled units) .within 0.01% DISTORTION, Direct coupled, DC to 5000 Hertz, 50VA ±10% (-20% @ DC).0.05% Transformer coupled, 100 to 5000 Hertz 45VA ±10% .0.1% HUM AND NOISE, % rated output. . 0.01% POWER REQUIREMENTS, 105-125 VAC or 210-250 VAC, 50 to 400 Hertz.125 Watts SIZE, Bench-mounted . 3y 2 H x 8W x 13D ACCESSORIES: NONE. HP style power cord is not included! IMPORTANT INFORMATION ABOUT DELIVERY: We cannot ship to an address that doesn't appear on eBay checkout page, NO EXCEPTIONS. In order to use your FedEx, UPS or DHL account you you must select Local pick up option at checkout and email us a prepaid shipping label. You will assume full responsibility if your item is lost in transit. If you need express delivery contact us BEFORE placing your bid. We must follow these rules because of eBay mandated dispute resolution policies.DUE TO A CUMBERSOME PROCESS OF DECLINING BIDS WE WILL NOT RESPOND TO OFFERS THAT ARE 51% BELOW LISTED PRICE