DISCO 70 80 90 | ADCOM GFA 5500 Made in USA | Complete Disassemble, Clean, Inspect, and Reassemble

Описание: ADCOM GFA 5500 Power Amplifier | Made in USA | Designed by Nelson Pass | Complete Disassemble, Clean, Inspect, and Reassemble

BIAS ALIGNMENT
Prior to performing BIAS ALIGNMENT turn unit on and allow to idle for approximately 5 MINUTES before attempting adjustments.
1. Connect millivoltmeter across emitter resistor R52 for left channel (R51 for right channel)
2. Adjust bias pot P2 until meter reads 50mV +/- 5mV

DC OFFSET ADJUSTMENT
1. Connect millivoltmeter across speaker output
2. Adjust DC offset pot P1 until meter reads 0mV +/- 10mV

GFA-5500 SPECIFICATIONS
Power Rating (To FTC Requirements)
200 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.18% THD

350 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.18% THD

IM Distortion (SMPTE)
1 watt to 200 watts into 8 ohms...............................................................................................0.05%
1 watt to 350 watts into 4 ohms.............................................................................................. 0.05%

IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
200 watts into 8 ohms...............................................................................................................0.04%
350 watts into 4 ohms.............................................................................................................. 0.04%

THD + Noise at 200 watts into 8 ohms (Typical)
20Hz.................. 0.018%
1kHz................... 0.02%
10kHz..................0.07%
20kHz..................0.13%

THD + Noise at 350 watts into 4 ohms (Typical)
20Hz.................... 0.018%
1kHz.....................0.02%
10kHz.................. 0.08%
20kHz.................. 0.16%

Frequency Response @ 1 Watt into 8 ohms (10Hz to 20kHz)...............+0, -0.25dB

Power Bandwidth (-3dB) ......................................................................... 3Hz to 130kHz

Dynamic Headroom into 4 ohms............................................................. 1.7 dB

Signal to Noise Ratio, “A” Weighted (200 watts into 8 ohms) ............... 100dB

Gain............................................................................................................ 29dB

Input Sensitivity
for 1 Watt.................................................................................................... 0.1 volts
for 200 Watts ............................................................................................. 1.4 volts

Input Impedance........................................................................................ 49.9kW

Damping Factor (20Hz to 20kHz).............................................................. 700

Rise Time (5kHz, 90V, peak-to-peak square wave, 20% to 80%)................5mS

Power Consumption (Continuous, All Channels Driven)
Quiescent ............................................................. 199VA
Maximum .............................................................. 855VA
80 watts into 8 ohms............................................ 1440VA
125 watts into 4 ohms.......................................... 720VA

Power (Available in 230VAC on special order)....115VAC - 50/60Hz

Chassis Dimensions ........................................... 7” (178mm) x 17” (432mm) x 13 3/4” (349mm)
Maximum Dimensions ....................................... 7 1/4” (184mm) x 17” (432mm) x 14 3/4” (375mm)

Weight.................................................................. 44 lb. (25.9 kg)
Weight, Packed.................................................... 50 lb. (28.6 kg)