美国精神/Threshold 是与马克、KRELL一样属于HI-END级的品牌。现在的PASS LAB的老板
就是原美国精神的创始人之一。美国精神的特点是石机胆味,推力很足。
每声道20只金封管,2声道40个功率管,品质超群,甲类100W, 甲乙类250W,一代经典名
器,推绝大多数音箱游刃有余
参数介绍:
Threshold S/500 Stereo Power Amplifier
Manufacturer\'s Specifications:
Rated Output Power : 250 watts per channel. Both channels driven at no more
than 0.1% distortion into 8 Ohms resistive or reactive impedance.
Bandwidth Response : Halfpower (-3 dB) points at 7 Hz and 100 kHz.
Slew Rate : 50 volts per microsecond
Output Transistors : 20 transistors per channel. Transistors are ultra-high
speed 200 volt 20 ampere rated power devices.
Output Current : 12 amperes continuous, 100 peak amperes per channel. All
continuous ratings are fuse governed.
Power Supply : 1,000 watt toroidal transformer, 120,000 microFarads storage
capacitance.
Input Impedance : 75,000 Ohms.
Output Impedance : Less than 0.1 Ohm 20 Hz through 20 kHz
Gain Factor : +26.6 dB
Noise : No greater than -100 Db, unweighted, referenced to
rated output.
Permissible Load : Operation is allowed into any load within limits
imposed by power supply and rail fusing and/or
thermal protection.
Dimensions : 17 1/8\" deep, 8 3/4\" high, 19\" wide.
Weight : 78 1/2 pounds.