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Replacing exciter lamp
The front part 43 of the soundhead casing
opens when the screw 40 is loosened. Lift
the lever a, Fig. 6, turn the exciter lamp
counterclockwise and withdraw it from its
holder.
Insert the new
exciter
lamp- again
after
lifting the lever a - in such a way that
the
positioning pins b,
c
and d pass through
the holes provided in the flange of the lamp
base.
Then turn the lamp clockwise as far
as it will go and press down the lever a.
With this amplifier the exciter lamp is
sup-
plied with pure direct current, due to a
special
electronic filter circuit. The voltage
va lue set for the exciter lamp is 3.6 V, to
provide for mains fluctuations.
Connection of microphone
The microphone is connected to
socket
65.
This is a low-impedance input
suitable
for
the
direc
t
connection
of
microphone
W
27
439-Z
1-A
2.
The
1
1 /
2
m long
connect1on
lead may be extended by using the 7
1 /
2
m
long microphone extension cable W
27 439-
ZS-A 1.
Fig 7
Dynamic
microphone wtth card1otd charac
teristic,
W
27439-Z 1-A
2
Contact
P1ns
2-3
low-impedance
P1ns
1-2
high-impedance
Transmiss1on range
60-12,000
cps
Discr~minat1on
at
180
incidence tn the medium
frequency
range
12
db
7
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