- 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 ohms
Idle Current 1.3A
Input Impedance 22kΩ
Max Current Draw 52A @ 4 ohms
83A @ 2 ohms
Dimensions: 15 1/8 x 12 5/16 x 2 3/8” (L x W x D)
(384mm x 313mm x 60mm)
Fuses: 30A x 2
JBL continually strives to update and improve existing products, as well as create new ones. The specifications and details in
this and related JBL publications are therefore subject to change without notice.
Power Amplifier GTO 75.4/75.4II
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