Adcom GFA-5300 Service Manual

2
a GFA-5300 SERVICE PARTS LIST
AMPLIFIER PCB
FOR RIGHT CHANNEL REPLACE 0XX WITH 1XX
SCHMATIC ADCOM PART NUMBER DESCRIPTION
LOCATION
C001 12005385 CAPACITOR ELEC 47uF 63V
C002 12001415 CAPACITOR POLY 39pF 50V
C004 12001275 CAPACITOR MYLAR 2.2uF 250v
C005 12005325 CAPACITOR ELEC 4.7uF 50V
C006 12001425 CAPACITOR POLY 390pF 50V
C007 12005385 CAPACITOR ELEC 47uF 63V
C008 120012025 CAPACITOR MYLAR 1uF 250V
C010 XXXXXX CAPACITOR CTC 18pF
C011 12001235 CAPACITOR MYLAR 0.1uF 250V
C012 12005385 CAPACITOR ELEC 47uF 63V
C013 12002155 CAPACITOR CEREMIC 0.1uF 50V
C014 12005380 CAPACITOR ELEC 47uF 25V
C015 12005090 CAPACITOR ELEC 10uF 25V
C016 12001240 CAPACITOR MYLAR 0.01uF 50V
C017 12005160 CAPACITOR ELEC 22uF 25V
C018 12002030 CAPACITOR CEREMIC 5pF 50V
C019,C020 12001305 CAPACITOR MYLAR 0.22uF 250V
C021,C022 XXXXX CAPACITOR ELEC 470uF 63V
C023,C024 12005010 CAPACITOR ELEC 1000uF 25V
D001-D005 16000082 DIODE ZENER 8.2V
D006 16004148 DIODE 1N4148
D007,C008 16000082 DIODE ZENER 8.2V
D009 16001254 DIODE LTL1254 (YELLOW)
D010 16001204 DIODE LTL1204 (RED)
D011 16004148 DIODE 1N4148
D012-D016 16004003 DIODE 1N4003
D058 16003600 DIODE ZENER 3.6V
M001,M002 19009400 FUSE T4A 125V
M006 32005200 THERMAL BREAKER UP72 85 DEGREE
Q001,Q002 33000992 TRANSISTOR 2SA992
Q003 33009210 TRANSISTOR IRFD9210
Q004 33001845 TRANSISTOR 2SC1845
Q005 33000992 TRANSISTOR 2SA992
Q006 33009610 TRANSISTOR IRF9610
Q007-Q009 33002100 TRANSISTOR IRFD210
Q011,Q012 33000610 TRANSISTOR IRF610
Q013,Q015 33002400 TRANSISTOR IRFP240
Q014,Q016 33000924 TRANSISTOR IRFP9240
Q017-Q019 33001845 TRANSISTOR 2SC1845
Q020 33000992 TRANSISTOR 2SA992
Q021 33008050 TRANSISTOR KTC8050
Q022 33008550 TRANSISTOR KTC8550
R003 27004620 RESISTOR 7.5K
R004 27001515 RESISTOR 4.7R
R005 27004265 RESISTOR 2.2K
R006 27004640 RESISTOR 1.5K

Adcom GFA-5300 Specifications

Power

power rating into 8 ohms	80 watts continuous average power per channel
power rating into 4 ohms	125 watts continuous average power per channel
power consumption - quiescent	100 VA
power consumption - maximum	720 VA
power consumption - 80 watts into 8 ohms	510 VA
power consumption - 125 watts into 4 ohms	720 VA
power supply voltage	115 VAC - 50/60 Hz

Distortion and Noise

IM distortion SMPTE 8 ohms	≤ 0.07%
IM distortion SMPTE 4 ohms	≤ 0.07%
IM distortion CCIF 8 ohms	≤ 0.035%
IM distortion CCIF 4 ohms	≤ 0.035%
THD + Noise at 80 watts into 8 ohms 20Hz	0.018%
THD + Noise at 80 watts into 8 ohms 1kHz	0.02%
THD + Noise at 80 watts into 8 ohms 10kHz	0.07%
THD + Noise at 80 watts into 8 ohms 20kHz	0.14%
THD + Noise at 125 watts into 4 ohms 20Hz	0.018%
THD + Noise at 125 watts into 4 ohms 1kHz	0.02%
THD + Noise at 125 watts into 4 ohms 10kHz	0.08%
THD + Noise at 125 watts into 4 ohms 20kHz	0.165%
signal to noise ratio (A weighted)	≥ 100 dB

Frequency and Gain

frequency response	+0, -0.25 dB from 10Hz to 20kHz
power bandwidth	3Hz to 130kHz
dynamic headroom into 4 ohms	2.1 dB
gain	29 dB

Input and Output

input sensitivity for 1 watt	0.1 volts
input sensitivity for 80 watts	0.9 volts
input impedance	49.9 kΩ
damping factor	≥ 350
rise time	1.8 µS

Weight and Dimensions

chassis dimensions	4 1/2” x 17” x 11 3/8” (105mm x 432mm x 289mm)
maximum dimensions	4 3/8” x 17” x 12 1/8” (111mm x 432mm x 308mm)
weight	22 lb. (10.0 kg)
weight, packed	25 lb. (11.3 kg)