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Amcron D150A II stereo laboratory amplifier.
This amazing sounding amplifier from the superb American Crown stable is still going strong. This example has done a bit of touring, so it has a slightly ‘loved’ appearance – but it is still top class. It has been my studio amplifier for the last few years, and has never let me down – here are the tech specs:
4 Stereo125 watts (20.97 dBW) minimum from 1 ~ 20,000 Hz at 0.05% THD.145 to 155 WPC (21.61 ~ 21.90 dBW) at 1 kHz at 0.1% THD.
Output Loads 4, 8 and 16.Safe with any load, including shorts open circuits and reactive loads although it will kick-in its protection circuitry with 2 loads. TopologyIt has a standard unregulated linear power supply with 45V DC rails and dual 9,400 uF 50V capacitors, and an extra low-current 55V rail to help in biasing.Class A + AB.The drivers operate in class A at low levels. The output transistors don’t turn on until the output demand it, at which point they are class B. The drivers handle all the zero-crossings.There’s an operational amplifier at the front end, and the IOCs light if the error output of this operational amplifier exceeds a certain value. Input Two mono ” unbalanced phone jacks, 25 k 30%.The inputs feed 25 k potentiometers directly, whose outputs feeds the amplifier. Input Sensitivity1.19 V 2% for rated power into 8.Sad part is Crown never really comes out and tells us the rated power for this D-150A Series II version.Since its gain is 20.6x (26.28 dB), 1.19 V in gives us 24.514 V out, or 75 watts for rated power.There’s an internal jumper to increase the gain to 0.775 V sensitivity. Frequency ResponseDC ~ 20,000 Hz 0.1 dB at 1 watt. DC ~ 100,000 Hz 1 dB at 1 watt. Phase ResponseDC ~ 15,000 Hz, +0 -15 at 1 watt. Signal to Noise Ratio110 dB below “rated power” into 8, 20-20,000 Hz measurement bandwidth.If you take rated power as 75 W (18.75 dBW), this means -91.25 dBW or 750 pW or 77.46 V or -82.22 dBV of noise.If you take rated power as 80 W (19.03 dBW), this means -90.97 dBW or 800 pW or 80 V or -81.94 dBV of noise. THD< 0.001% from 20 ~ 400 Hz, increasing linearly to 0.05% at 20,000 Hz at 80 W. IMD< 0.05% from 10 to 250 mW.<0.01% from 250 mW to 80 W. Slew Rate6 V/S. Damping Factor & Output Impedance> 400 damping factor into 8 from DC to 400 Hz.< 15 m in series with < 3 H output source impedance. Output Connectors Lab standard 3/4" spaced 5-way binding posts.Designed for standard MDP lab connectors.
Condition is Used. Dispatched with Other 48h Courier.
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Category: Musical Instruments:Pro Audio Equipment:Amplifiers
Location: Twickenham