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CHANNEL 1 OUTPUT FUSE (Fig. 2 - Item 5)
CHANNEL 2 OUTPUT FUSE (Fig. 2 - Item 6)
These fuses are connected in series with their re¬
spective speaker jacks. They protect the speakers in
the event of amplifier failure, and prevent damage to
the amplifier caused by driving low impedance
loads. Each fuse is rated at 6 amperes, 250 volts, and
should be replaced only with one of the same rating
and type (Littlefuse, catalog number 312006, or
equivalent).
MODE SWITCH (Fig. 2 - Item 7)
This switch selects one of the following amplifier
modes of operation.
Stereo: Normal dual channel operation.
Mono: Connects the inputs of both channels to¬
gether. In this mode a signal input to channel 1 is also
input to channel 2. This mode eliminates the use of a
"Y" cord in monophonic sound applications.
Bridged: Converts the SRA 400 into a single chan¬
nel 400 watt amplifier. The input is applied to channel
1, and the input of channel 2 should NOT be used.
The gain is controlled by the channel 1 input at¬
tenuator. The load is connected across the red
banana terminals. Minimum load is 8 ohms. Opera¬
tion into smaller loads will trigger the protective cir¬
cuitry and cause the amplifier to shut off.
FAN (Fig. 2 - Item 8)
This fan cools the tunnel heatsink and power transis¬
tors of the SRA 400 while in operation. To insure
adequate airflow be sure that the fan opening is not
blocked during operation. An internal thermostat au¬
tomatically switches the fan to high speed when the
heatsink temperature rises above 60°C (140°F).
FIGURE 2 — Rear Panel
2
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