Adcom GFA-5300 Service Manual

3
R007 27004670 RESISTOR 100R
SCHMATIC ADCOM PART NUMBER DESCRIPTION
LOCATION
R008 27004570 RESISTOR 221R
R010,R012 27004200 RESISTOR 10K
R013 27004570 RESISTOR 221R
R014 27004300 RESISTOR 15K
R015 27004110 RESISTOR 2K
R016 27004135 RESISTOR 4.99K 1/2W
R017 27004570 RESISTOR 221R
R018 27004400 RESISTOR 1.82K
R019 27004600 RESISTOR 4.75K
R020,R021 27004500 RESISTOR 49.9K
R022 27004200 RESISTOR 10K
R023 27004400 RESISTOR 1.82K
R024 27004600 RESISTOR 4.75K
R026,R027 27004570 RESISTOR 221R
R028 27003200 RESISTOR 5.1R 2W
R030 27004225 RESISTOR 475R
R031 27004670 RESISTOR 100R
R034-R037 27004570 RESISTOR 221R
R038-R041 27006095 RESISTOR 0.33R 3W
R042 35001355 DC OFFSET VR 5K
R043 35001355 BIAS VR 5K
R044 27004500 RESISTOR 49.9K
R045,R046 27004670 RESISTOR 100R
R047 27004200 RESISTOR 10K
R050 27004160 RESISTOR 47.5K
R051 27004050 RESISTOR 1K
R052 27004435 RESISTOR 22R
R053 27004500 RESISTOR 49.9K
R054 27004200 RESISTOR 10K
R055 27004265 RESISTOR 2.2K
R056 27004630 RESISTOR 220K
R057 27004050 RESISTOR 1K
R058 27004071 RESISTOR 5.1K
R059 27001160 RESISTOR 33K
R060 27004500 RESISTOR 49.9K
R061 27004570 RESISTOR 221R
R062,R063 XXXXXX RESISTOR 56R
R064 27004570 RESISTOR 221R
R065,R066 27003010 RESISTOR 10R 1/2W
R067,R068 27004071 RESISTOR 5.1K
R069,R070 27003010 RESISTOR 10R 1/2W
U001 21005550 IC LM555

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)