Ampeg Portaflex Series User Manual

5
PF-20T / PF-50T Bass Guitar Amplifier
Rear Panel Features
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11. POWER SWITCH: Use this switch to
turn the overall System Power on or o.
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 o. 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, helping
to extend tube life. This switch should
be OFF when rst turning the amplier
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 10 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 aected by any EQ or
Boost settings. With the switch in the
OUT position, the signal is Post-EQ and
is controlled and modied by the tone
controls.
17. PREAMP OUT: This signal may
be used to feed an external power
amplier, 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
amplier, mixing console, interface, or
house PA system.
The Lift / Gnd switch [18] is available
to reduce any noise that may occur.

Ampeg Portaflex Series Specifications

General

Brand	Ampeg
Model	Portaflex Series
Category	Amplifier
Language	English