Vintage HCA855A

Direct coupled - no capacitors or inductors in signal path
DC Servo and relay protection circuits
High bias Class A/AB operation
1 kVa Toroid power transformer with independent secondary windings for each channel, 68,000 µF power supply filter capacitance
Independent power supplies for each channel
Input stages use hand matched complementary JFETs
20 matched 15 amp, 50 MHz bipolar output transistors
AC present, standby/normal, current overload indicators
Rear mounted gain controls and rear handles
12 volt DC automatic turn-on circuitry Gold-plated metal structure RCA input jacks
Gold-plated 5 way speaker binding posts
Custom designed removable IEC AC cord
Three rack space height front panel
Rack mounting adapter available (RMK-3)

Continuous Power Output:
85 watts RMS x 5, 20 Hz-20 kHz, 8 Ω
125 watts RMS x 5, 20 Hz-20 kHz, 4 Ω
Current Capacity:
30 amps peak per channel
Slew Rate:
> 130 V/microsecond
Power Bandwidth:
5 Hz-100 kHz, +0/-3 dB at 1 watt
Total Harmonic Distortion:
IM Distortion:
TIM:
Unmeasureable
Dynamic Headroom:
> 1.5 dB
Interchannel Crosstalk:
> 80 dB at 1 kHz
> 60 dB at 20 kHz
Input Impedance:
33 k Ω
Input Sensitivity:
1 V for 28.28 V 1.2 V for full output
S/N Ratio:
> 115 dB, full power, IHF A-weighted
Damping Factor:
> 800 at 20 Hz
Dimensions:
17" wide x 5 1/4" high x 16" deep (6" high with feet)
Power Requirements:
110 Vac-120 Vac 750 Watts
Net Weight:
41 lb

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