JBL GTO 75.2, Service Manual

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- CONTENTS -
SPECIFICATIONS ………………………………….……..1
FEATURES/TEST CONDITIONS……..…………………2
INSTALLATION………………….……...……..…...…...…3
CONNECTIONS………………….……...……..…...…..…4
SET-UP/CONTROLS ……..………………..…….….…...5
INSTALLING NEON TUBES..…….…….………………..5
BASIC TROUBLESHOOTING..…….…….………………6
TYPICAL SYSTEM WIRING..…….…….……………..…7
EXPLODED VIEW/PARTS LIST…….….….…………....8
MECHANICAL PARTS LIST..…….…….……………......9
AMPLIFIER BLOCK DIAGRAM…………………….……10
P.C.B. DRAWINGS….……………………………….…….11
ELECTRICAL PARTS LIST ..……….……….…….….…13
VERSION II ELECTRICAL PARTS LIST ADDENDUM
….……….16
IC/TRANSISTOR PINOUTS..……..….…….….….….…..17
GTO75.2 SCHEMATICS………..……………...………...19
GTO75.2II SCHEMATICS……………….….…………...21
PACKING……..…………………………………………....23
GTO 75.2/75.2II Specifications
Output Power: 97W RMS x 2 channels @ 4 ohms; ≤ 1% THD + N
(14.4V supply) 145W RMS x 2 channels @ 2 ohms; ≤ 1% THD + N
290W RMS x 1 channels @ 4 ohms; ≤ 1% THD + N
Signal-to-noise ratio: 82dBA (reference 1W into 4 ohms)
Dynamic power: 190W @ 2 ohms
Effective damping factor: 6.39 @ 4 ohms
Frequency response: 10Hz – 90kHz (–3dB)
Maximum input signal: 5.5V
Maximum sensitivity: GTO 75.2 - 230mV
GTO 75.2II - 75mV
DC Offset <50mV (-50%)
Output regulation: .098dB @ 4 ohms
Idle Current 1.0A
Input Impedance 22k Ω
Max Current Draw 23A @ 4 ohms
37A @ 2 ohms
Dimensions: 11 5/8 x 12 5/16 x 2 3/8” (L x W x D)
(295mm x 313mm x 60mm)
Fuse: 30A
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.
1
Power Amplifier
GTO 75.2/75.2II