Page 11 of 16
Tape Out
This output uses a phono connection (see Rear Panel No.17 on Page 8, labelled TAPE
OUT – phono connection diagram below)
Pin
(Signal)
Sleeve
(Screen)
Two phono sockets are available. These are connected together internally and provide a
fixed mono output, independent of the master gain control.
Loudspeaker Out
It is possible to connect 100V line loudspeakers or 8
Ω
low impedance loudspeakers (see
Rear Panel No.14 on Page 8).
Under no circumstances must the two be mixed.
The output
is overload protected.
Two loudspeaker outputs are available – ‘Music & Speech’ and ‘Speech Only’.
•
‘Music & Speech’ gives a permanent output of all signals passing through the
amplifier. Three terminals are provided. COM gives a common (0V)
connection for both 100V and 8
Ω
operation. Connect the loudspeaker circuit
to 100V if 100V line loudspeakers are being used or connect to 8
Ω
if low
impedance loudspeakers are being used. Do not connect any circuit where
the load impedance is less than the minimum source impedance (for
example, if wiring to the 8
Ω
terminal, the total load impedance must not be
less than 8
Ω
).
•
‘Speech Only’ gives an output during a priority condition only. The two
terminals are 100V line terminals only. They are useful when an area needs
coverage only from a priority source such as a paging microphone.
Loudspeaker Loading
To allow sufficient transient overload margin it is suggested that the output load should not
exceed approximately 70% of the rated power output.
dc Power
The amplifier may be operated from a battery power source (see Rear Panel No.13 on
Page 8 and diagram below).
Ensure correct polarity connection
when connecting batteries.
The amplifier requires a 24V dc source. Both dc and ac power supplies can be used
simultaneously. If an ac supply is present the amplifier will automatically use this. Failure
of the ac supply will cause the amplifier to switch to the dc supply if present. The dc
supply is unswitched, so an external switch will need to be fitted to isolate this supply.
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