Used Parasound A51 5-Channel Power Amplifier for sale
Black finish
5 Channel power amplifier
Tested and working
No original box/packaging
 
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Circuitry designed by legendary John Curl
THX Ultra2 certified
High bias Class A/AB operation
Balanced inputs with discrete circuits and XLR connectors
Direct Coupled - no capacitors or inductors in signal path
Complementary MOSFET driver stage and JFET input stage
40 beta-matched 15 amp, 60 MHz bipolar output transistors
2.2 kVA encapsulated toroid power transformer with independent
  secondary windings for each channel
164,000 μF power supply filter capacitance
DC Servo and relay protection circuits
AC present, channel status, high temperature indicators
Heavy-duty 24k gold-plated 5-way speaker terminals
Gold-plated RCA input jacks; ground lift switch
Auto turn-on by 12v trigger or audio signal
4u Chassis, carry handles, rack mounting adapter included
 
Continuous power output:
250 watts RMS x 5, 20 Hz - 20 kHz, 8 Ω, all channels driven
400 watts RMS x 5, 20 Hz - 20 kHz, 4 Ω, all channels driven
 
Current capacity:
60 amperes peak per channel
 
Power bandwidth:
5 Hz - 100 kHz, +0/-3 dB at 1 watt
 
Total harmonic distortion:
< 0.2 % at full power
 
IM distortion: balanced 16 V rms
< 0.04 %
 
Slew rate:
> 130 V/µsecond
 
Dynamic headroom:
> 1.5 dB
 
Interchannel crosstalk:
> 78 dB at 1 kHz;
> 63 dB at 20 kHz
 
Input sensitivity:
1 V for 28.28 V, THX Reference Lev
 
Input impedance:
47 k Ω unbalanced; 94 k Ω balanced
 
S/N ratio:
112 dB, input shorted, IHF A-weighted
 
Damping factor:
> 1100 at 20 Hz
 
Voltage:
110V - 120V
 
Dimensions:
17-1/2" w x 7-5/8" h x 20" d, 7" h without feet
 
Net weight: 80 lb.