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GFA-5500 Voltage Conversion

The GFA-5500 amplifier is produced in both a 120VAC only version and a multivoltage (120VAC or 230VAC
convertible) version.  The version can usually be distinguished by external inspection.  The 120VAC only
version has a fixed AC line cord.  The convertible version has a detachable line cord.  Internally, their are two
differences.  The toroid transformer in the convertible version has 2 primaries; the first primary has a black
and brown lead, the second primary has a black and brown lead with white stripe.  The toroid transformer in
the 120VAC only version has only the brown and black lead (1 primary winding).  Additionally, the
connecting block mounted next to  the power switch is different in both versions.  In the multivoltage unit,
this connecting block has 6 pair of mounting leads (as is shown in the figures below).  In the 120VAC only
version, the connecting block has only 4 pairs of mounts.

The conversion procedure for the multivoltage GFA-5500 unit is listed below.

Conversion of Multivoltage Units

120V to 230V

1. Unplug the amplifier and remove the top cover.
2. Locate the connecting block mounted next to the power switch.
3. Move the transformer leads so they are configured as shown in figure 1.
4. Change the rear panel AC fuse from 12A to 6A, AGC.  Place a sticker on the rear panel at the fuse holder
to show the new value fuse (6A) and new value operating voltage (230VAC).
5. Test the unit with a 230VAC source.

Figure 1: Transformer lead configuration for 230VAC operation (multivoltage units)

KC103P

KCC

CL-10

White

(from AC fuse)

Brown

(to xformer)

Brown/White

(to xformer)

Black

(to xformer)

Black/White
(to xformer)

Summary of Contents for GFA-5500

Page 1: ...HANNEL POWER AMPLIFIER GFA 5500 TABLE OF CONTENTS Introduction 1 Test Procedures 1 Parts List 2 Specifications 5 Schematic 9 10 Timber Lane Marlboro NJ 07746 USA Tel 732 683 2356 Fax 732 683 9790 Web...

Page 2: ...THIS AMPLIFIER MAXIMUM OUTPUT POWER MINIMUM THD AND HEAT DISSIPATION ARE AFFECTED BY THE BIAS SETTING AND MUST BE CORRECT TO MAINTAIN THE SONIC QUALITY AND LONGEVITY OF THE AMPLIFIER BIAS ALIGNMENT P...

Page 3: ...10 TRANSISTOR IRF610 Q12 33000042 TRANSISTOR MPSA42 Q13 33000042 TRANSISTOR MPSA42 Q14 33000092 TRANSISTOR MPSA92 Q15 33002400 TRANSISTOR IRFP240 Q16 33000924 TRANSISTOR IRFP9240 Q17 33002400 TRANSIST...

Page 4: ...COM PART NUMBER DESCRIPTION LOCATION BR1 BR2 16003506 BRIDGE RECTIFIER 600V 35A DB3506 T C1 12001235 CAPACITOR MYLAR 0 1uF 250V C10 C11 12005525 CAPACITOR ELEC 18 000uF 100V C12 C13 12001235 CAPACITOR...

Page 5: ...1000 RESISTOR 4 7R 2W 5 MOF OTHERS SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C21 12001510 SPARK KILLER 0 01uF 400V F5 19001200 MAIN FUSE 12A 250V TH3 33005800 THERMISTOR CL101 13005500 FRONT PA...

Page 6: ...n both versions In the multivoltage unit this connecting block has 6 pair of mounting leads as is shown in the figures below In the 120VAC only version the connecting block has only 4 pairs of mounts...

Page 7: ...ange the rear panel AC fuse from 6A to 12A AGC Place a sticker on the rear panel at the fuse holder to show the new value fuse 12A and new value operating voltage 120VAC 5 Test the unit with a 120VAC...

Page 8: ...0kHz 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 H...

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