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GFA-7605 SPECIFICATIONS 

Power Rating (To EIA/CEA-490-A Requirements) 

125 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with 
all channels driven at less than  1.00% THD 
150 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with 
all channels driven at less than 1.00% THD 

 

IM Distortion (SMPTE) 

 

1 watt to 100 watts into 8 ohms ...........................................................................................................................  

 0.075% 

 

1 watt to 150 watts into 4 ohms ...........................................................................................................................  

 0.075% 

 

IM Distortion (CCIF, Any Combination from 4kHz to 20kHz) 

 

100 watts into 8 ohms..........................................................................................................................................  

 0.025% 

 

150 watts into 4 ohms..........................................................................................................................................  

 0.025% 

 

THD + Noise at 100 watts into 8 ohms (Typical) 

 20Hz .....................................................................................................................................................................  0.0012% 
 1kHz .....................................................................................................................................................................  0.0012% 
 10kHz .......................................................................................................................................................................  0.02% 
 20kHz .....................................................................................................................................................................  0.025% 
 

THD + Noise at 150 watts into 4 ohms (Typical) 

 20Hz .......................................................................................................................................................................  0.025% 
 1kHz .......................................................................................................................................................................  0.025% 
 10kHz .................................................................................................................................................................... . 0.035% 
 20kHz .....................................................................................................................................................................  0.045% 
 

Frequency Response @ 1 Watt into 8 ohms (10Hz to 20kHz)

................................................................................. +0, -0.25dB 

 

Power Bandwidth (-3dB)

...................................................................................................................................... 1.5Hz to 65kHz 

 

Dynamic Headroom into 4 ohms

.......................................................................................................................................  2.5 dB 

 

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

.................................................................................... . 

 110dB 

 

Gain

........................................................................................................................................................................................  29dB 

 

Input Sensitivity 

 for 

Watt...............................................................................................................................................................  0.1 volts 

 for 

100 

Watts .........................................................................................................................................................  1.0 volts 

 

Input Impedance

................................................................................................................................................................... 50k

 

 
Damping Factor (20Hz to 20kHz)

........................................................................................................................................  

 400 

 
Rise

 

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

...................................................................................... 4.5

µ

 

Power Consumption (Continuous, All Channels Driven) 

 Quiescent ..................................................................................................................................................................  96VA 
 Maximum...............................................................................................................................................................  1440VA 
 

100 watts into 8 ohms............................................................................................................................................  1165VA 

 
Power 

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

Chassis Dimensions

...............................................................................................  5” (127mm) x 17” (432mm) x 14” (355.6mm) 

Maximum Dimensions

.........................................................................................  5 3/4” (146mm) x 17” (432mm) x 15” (381mm) 

Weight

....................................................................................................................................................................  42 lb. (19.1 kg) 

Weight, Packed

.....................................................................................................................................................  48 lb. (22.8 kg) 

 

Summary of Contents for GFA-7605

Page 1: ...TABLE OF CONTENTS Introduction 1 Test Procedures 1 Parts List 2 Voltage Conversion 5 Specifications 7 PCB Layouts 8 Schematic 9 8551 East Anderson Drive Suite 105 Scottsdale Arizona 85255 USA Tel 480...

Page 2: ...LONGEVITY OF THE AMPLIFIER BIAS ALIGNMENT The component references are the same for all channels Operate the amplifier without load or input connection for this adjustment 1 Turn the amplifier on and...

Page 3: ...F 100V C17 CAPACITOR ELEC 22uF 35V C18 CAPACITOR ELEC 10000uF 63WV C19 CAPACITOR ELEC 10000uF 63WV C20 CAPACITOR MYLAR 0 22uF C21 CAPACITOR MYLAR 0 22uF C22 CAPACITOR ELEC 100uF 16V C23 CAPACITOR ELEC...

Page 4: ...8 RESISTOR 100 R19 RESISTOR 475 R20 RESISTOR 37 4 R21 RESISTOR 37 4 R22 RESISTOR 75 R23 RESISTOR 2 74K R24 RESISTOR 1K R26 RESISTOR 392 R27 RESISTOR 392 R28 RESISTOR 10 R29 RESISTOR 49 9 R30 RESISTOR...

Page 5: ...N RELAY LED1 POWER LED LTL1204 RED Q1 TRANSISTOR MPSA13 R1 RESISTOR 1K 1W R2 RESISTOR 3 32K R3 RESISTOR 10K R4 RESISTOR 3 32K T1 STANDBY TRANSFORMER TH1 THERMISTOR CL100 U2 REGULATOR IC 7812 POWER SWI...

Page 6: ...tch is different in both versions In the multivoltage unit this connecting block has 5 pair of mounting leads as is shown in the figures below In the 120VAC only version the connecting block has only...

Page 7: ...shown in figure 2 4 Add heavy gauge wire between screw down portion of terminals as shown 4 Change the rear panel AC fuse from 6A to 12A AGC Place a sticker on the rear panel at the fuse holder to sho...

Page 8: ...1kHz 0 0012 10kHz 0 02 20kHz 0 025 THD Noise at 150 watts into 4 ohms Typical 20Hz 0 025 1kHz 0 025 10kHz 0 035 20kHz 0 045 Frequency Response 1 Watt into 8 ohms 10Hz to 20kHz 0 0 25dB Power Bandwidth...

Page 9: ...8...

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