File name Jbl-GTO75.4_75.4II caramp.pdfGTO Series
75.4
75.4II
4 CHANNEL POWER AMPLIFIER
SERVICE MANUAL
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797 Rev3vvv10/2005
Power Amplifier GTO 75.4/75.4II
- CONTENTS -
SPECIFICATIONS ...1
FEATURES/TEST CONDITIONS...2
INSTALLATION...3
CONNECTIONS...4
SET-UP/CONTROLS ...5
INSTALLING NEON TUBES...5
BASIC TROUBLESHOOTING...7
TYPICAL SYSTEM WIRING...8
EXPLODED VIEW/PARTS LIST...9
MECHANICAL PARTS LIST...10
AMPLIFIER BLOCK DIAGRAM...11
P.C.B. DRAWINGS...12
ELECTRICAL PARTS LIST ...16
VERSION II ELECTRICAL PARTS LIST ADDENDUM...19
IC/TRANSISTOR PINOUTS...20
GTO 75.4 SCHEMATICS...23
GTO 75.4II SCHEMATICS...26
PACKING...29
GTO 75.4/75.4II Specifications
Output Power: 104W RMS x 4 channels @ 4 ohms; 1% THD + N
(14.4V supply) 142W RMS x 4 channels @ 2 ohms; 1% THD + N
284W RMS x 2 channels @ 4 ohms; 1% THD + N
Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)
Dynamic power: 163W @ 2 ohms
Effective damping factor: 6.38 @ 4 ohms
Frequency response: 10Hz 83kHz (3dB)
Maximum input signal: 5.8V
Maximum sensitivity: GTO 75.4 - 230mV
GTO 75.4II - 75mV
DC Offset <50Mv (-50%)
Output regulation: .069dB @ 4 ohm |