This listing is no longer active

Parasound A-21 Class A/AB Amp [Expired]

no longer for sale

Item Description

I'm the original owner of this fantastic Parasound Halo A-21 amp, its only 3 months old so as you can imagine it's in excellent condition... my loss is your gain!! I've decided to now move to an all valve system so my A-21 is up for sale. These amps don't come onto the used market often simply due to their top class performance. Read the reviews. I don't have original boxing but will carefully double box the unit and can assist with international shipping. Item is in factory 220-240v trim.

Preferred payment by direct wire.

"Editors' Choice Award" 2012 - The Absolute Sound Magazine

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
16 beta-matched 15 amp, 60 MHz bipolar output transistors
1.2 kVA encapsulated toroid power transformer with independent
secondary windings for each channel
100,000 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, 12v trigger out

Power Output - Both Channels Driven
250 watts RMS x 2, continuous, 20 Hz - 20 kHz, 8 Ω
400 watts RMS x 2, continuous, 20 Hz - 20 kHz, 4 Ω
Power Output - Mono (Bridged) 750 watts RMS, 20 Hz - 20 kHz, 8 Ω Current Capacity
60 amperes peak per channel
Slew Rate > 130 volts per microsecond
Frequency Response 5 Hz-100 kHz, +0/-3 dB at 1 watt
Total Harmonic Distortion < 0.2 % at full power, < 0.03 % at typical listening levels
IM Distortion < 0.04 %
TIM Unmeasureable
Dynamic Headroom > 1.5 dB
Interchannel Crosstalk > 80 dB at 1 kHz > 63 dB at 20 kHz
Input Impedance Unbalanced: 33 kΩ Balanced: 66 kΩ
Input Sensitivity for 28.28 V Output into 8 Ω Unbalanced: 1 V Balanced: 1 V per leg
Loop Output Level
Same as input level
S/N Ratio > 112 dB, input shorted, IHF A-weighted > 102 dB, input shorted, unweighted
Damping Factor > 1100 at 20 Hz
DC Trigger Requirements +9 Vdc to +12 Vdc, 2 mA
Audio Trigger Requirements 50 mV AC - 200 mV AC
DC Trigger Output Capacity Requirements +12 Vdc, 150 mA
Dimensions Width: 17-1/2” (445 mm)
Panel height: 7” (178 mm) Height with feet: 7-5/8” (194 mm) Depth: 19-1/8” (485 mm)
Power Requirement Standby: 25 Watts, Full Power into 4 Ω: 1500 Watts
Net Weight 60 lb. (27.3 kg)
Shipping Weight 74 lb. (33.7 kg)