Installation
The 6007/6008 is suitable either for rack mounting in
three EIA rack spaces without additional bracing or
ventilation, or for counter-top placement. A full set of
mounting hardware is packed with each unit. All exter-
nal connections and matching/bridging transformer
option are made on the rear panel, Figure 1.
Operating Temperature
Because the 6007/6008 is cooled by convection,
adequate clearance on the top of the unit must be
provided to allow heat dissipation. The minimum
recommended clearance when stacking the unit is
one EIA standard panel space.
A thermal switch in these units provides thermal
protection by shutting down the amplifier if the internal
temperature exceeds a safe operating level. The max-
imum allowable ambient temperature for the amplifier
is 6 0 ° C (140°F).
Operating Controls
All operating switches, meter and level control are
located on either the front panel or the rear panel,
Figure 1. Control, meter and switch functions are given
in Table 1.
Input Connections
Input connections to the amplifier may be either direct-
coupled or transformer-isolated at the LINE terminal
strip, TB301, or the RCA-type phono jacks, J301,
Figure 1. Direct-coupling is accomplished by con-
necting the center conductor of a shielded cable to
LO and the shield lead to GND, or to either RCA-type
phono jack. Table 2 lists the terminals and the RCA-
type phono jacks and applications of the LINE terminal
strip. For transformer-isolated input, a 5195 matching/
bridging transformer [Figure 2} must be plugged into
the 9-pin receptacle, XK301, Figure I.The input leads
are connected to terminals HI, LO and GND of the
LINE terminal strip.
Output Connections
Table 3 shows the output configurations available.
TABLE 1
Gain
Controls input of amplifier. Control is wired
ahead of the active circuitry and can be used as
an input pad to prevent overloading and clipping
of the non-inverting operational amplifier stage.
NOTE: When the JBL 5195 matching/bridging
transformer is used, the gain control is across
the output of the transformer and therefore can-
not be used to prevent input transformer satur-
ation if excess input levels occur.
Power Switch
Applies primary power to amplifier.
Meter
Provides approximation of the output level,
with + 3 indicating that the amplifier is deliver-
ing its rated continuous sine wave power into
4
o.
Low cut/out
Offers the user a response roll-off of 6 dB per
octave below 250 Hz.
FIGURE 2
Terminals
RCA-Type
Phono Jacks Function
Application
Terminating Resistor Special Instructions
50
kO
G N D
Direct Coupled
For unbalanced high impedance
(50 kO) sources
— none—
" A " o r " B "
- n o n e —
HI
LO
G N D
Transformer isolated Balanced high impedance
(15 kO) source up to level of
+ 15 dBm (with 5195 matching/
bridging transformer)
— none—
Balanced 600 O source up to
level of +15 d B m (with 5195
transformer)
620 O,
V
2
W, connected
to terminals " H I " and "LO'
Balanced 600 O source with
up to level of 4 d B m with
14 dB additional gain.
— n o n e -
Internal modification
requiring service
technician.
Terminals
(TB301)
Terminals
(TB302)
Impedance
Direct Out
Transformer Out
Link
LO, Chassis G N D
4 0 ( 2 0 V)
Yes
None
8 O . C 0 M
8 0 ( 2 8 . 2 8 V)
Yes
" H I " t o " X F M R Primary"
16
a,
C O M
16 0 ( 4 0 V)
Yes
" H I " t o " X F M R Primary"
70.7 V C O M
50 O
Yes
" H I " t o " X F M R Primary"'
TABLE 2 / T A B L E 3