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PF-20T / PF-50T Bass Guitar Amplifier
7
PortaFlex Series Rear Panel Features
11. POWER SWITCH: Use this switch to
turn the overall system power on or off.
Press the top of the switch to turn on
the power. The power switch should be
engaged prior to the standby switch (as
mentioned below, #12).
12. STANDBY SWITCH: Use this switch
to turn the standby power on or off.
Press the top of the switch to disengage
the standby circuit [ON position]. The
Standby mode allows the tubes to warm
or remain warm without high voltage
being applied to them. This extends tube
life. This switch should be OFF when first
turning the amplifier on. Allow the unit
to warm up for at least 20 seconds
before switching to the ON position.
During short periods of non-use, the
amp should be put into Standby mode.
13. FUSE: This protects the unit from
damage due to overload conditions
or power line surges. If the fuse blows,
replace it only with the same size and
type.
14. IEC POWER INPUT CONNECTOR:
This is where you connect the supplied
AC power cord. Plug the male end of
the cord into a grounded AC outlet.
DO NOT DEFEAT THE GROUND PRONG
OF THE AC PLUG!
15. BIAS SECTION: This control and set
of LEDs allow the user to properly bias
the power amp. See “Setting Tube Bias”
on page 12 for a complete description
of how to use this section.
16. POST-EQ/PRE-EQ: The signal at
the preamp out can be set to either
Pre-EQ or Post-EQ with this switch.
With the switch in the IN position,
the signal at the preamp out is Pre-EQ.
This is a direct output not affected
by any EQ or boost settings. With
the switch in the OUT position, the
signal is Post-EQ and is controlled
and modified by the tone controls.
17. PREAMP OUT: This signal may be used
to feed an external power amplifier,
mixing console, interface or house PA
system.
The lift/gnd switch [18] is available
to reduce any noise that may occur.
18. LIFT / GND: When this switch is
engaged, it connects the ground
connection to help reduce residual hum
and buzz sometimes picked up in the
signal cables.
19. TRANSFORMER BAL OUT: This signal
may be used to feed an external power
amplifier, mixing console, interface or
house PA system.
The lift/gnd switch [18] is available
to reduce any noise that may occur.
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