JBL 6006B Schematic

Page 1

The JBL 60068 is a highly reliable, conservatively rated
amplifier, designed for professional sound engineering
applications where a high degree of performance is
required.

The circuitry has been carefully designed to reduce the
possibility of failure within the specified environmental
and electrical conditions. A protective circuit is utilized
in this amplifier which makes it virtually impossible to
damage it under any conditions of overload, including
'shorted or grossly mismatched load, inductive load at low
frequencies, capacitive load at high frequencies, excessive
input signal, white noise or installation errors.

The JBL 60068 can be overdriven by at least ten times
normal input voltage, from 40Hz-12 kHz, and eventually
produces square waves increasing in RMS value up to abOUt
110 watts at which point the output actually begins to
decrease.

The DC fuse is intended as a protective device for the
power supply in the event of output stage malfunction.
It is not intended to protect the output transistors which
are guarded by the special circuitry provided. As an

indication of high-frequency stability. the JBL 60068
draws only 30% more power from the AC line at 12 kHz,
60W, than at 1 kHz for at least one hour without mal-
function or entering the "protect" mode.

The 60068 amplifier is designed for maximum flexibility
in varying input and output arrangements. A standard
unbalanced 50K input is provided which can be con-
verted to balanced line bridging or matching with the
installation of the accessory 5195 transformer. A low cut
filter switch reduces the possibility of damaging horns.
All the power outputs are balanced and the bridging out
put unbalanced.

The excellent engineering of this unit is accompanied by
an equally excellent layout with serviceability in mind at
all times. All components are accessible and easily re
placed with particular emphasis on output and driver
device removal and installation.

Page 2

Model 6006 B - Power Amplifier 7 "

Architectural Specifications

The amplifier shall be capable of delivering an output of
60W RMS with less than 1.0% THD, 4042.000 Hz, and
75W RMS from 50 to 8000 Hz with less than 4% THD.

The high impedance program input shall be provided with
a socket to accommodate a balanced line with isolation.
Matching and bridging inputs shall be available. Screw
type terminal boards shall be provided for the balanced
line inputs as well as for the high impedance unbalanced
input. In addition, a phono plug shall be provided for the
high impedance input. A low frequency filter switch shall
be provided.

The amplifier shall have balanced 8-ohm, 16~ohm and
70.7~volt outputs on a screw type terminal board listed
by Underwriters' Laboratories, Inc. for class 2 wiring.

The amplifier shall be equipped with a protective circuit
which will prevent damage due to overload. A power out-
put meter shall be standard equipment.

The amplifier shall operate on 120/240 VAC, 50/60 Hz
power source.

The performance specifications shall be as listed under
SPECIFICATIONS and shall be met or exceeded.

The amplifier shall be listed by the Underwriters'
Laboratories, Inc.

The amplifier shall be JBL Model 60063.

. mm. W... .

\

. Elna Professional Series

Professional Division "

James B Lansmg Sound. Inc 3249 Casxlas Avenue Los Angeies California E-

(A,