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6. POWER CORD
Connect to a properly configured outlet providing the line voltage specified for your model.
7. FAN SPEED
Push-button switch that sets the idle speed of the cooling fans. For normal usage, use the low-speed position.
The fan speed is proportional to the amplifier power output.
8. FUSE
AC power line fuse for the pt1250. For the 120-volt pt1250, use only one of the following, 10 ampere slo-
blo fuses: Bussman MDA 10-amp, Little Fuse 3AB 10-amp, Schurter SPT (001.2534) 10-amp. For the 230-
volt model, use only: Bussman MDA 5-amp, Little Fuse 3AB 5-amp, Schurter SPT (034.5239) 5-amp.
Repeated fuse blowing is a sign of internal distress.
9. LEFT/RIGHT SPEAKER OUTPUT
5-way binding posts used to connect the loudspeakers to the amplifier outputs. The red terminal is the signal
connection, the black terminal is the signal return connection. The black terminals are internally connected together.
10. GROUND
Barrier strip connections. Removing this jumper isolates the amplifiers power supply ground from the
amplifier chassis. This may be necessary to eliminate ground loops in some systems. The amplifier chassis
is always connected to the safety ground (line plug ground or green wire) of the power cord. With the jumper
removed, the amplifier’s circuit ground is connected to the amplifier’s chassis ground via a 27-kilohm
resistor in parallel with a 0.1-mfd capacitor..
11. INPUTS
Each channel has parallel connected female XLR connectors and 1/4 inch tip-ring-sleeve phone jacks. These
are the input connectors for the amplifier. Since the jacks are connected in parallel, the remaining jack can
be used as an output when daisy-chaining several amplifier inputs.
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