Ampeg PF-20T Handleiding

Ampeg Niet gecategoriseerd PF-20T

Lees hieronder de đź“– handleiding in het Nederlandse voor Ampeg PF-20T (6 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 49 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

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Owner’s Manual
PF-20T and PF-50T
Bass Guitar Amplifiers
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.
/
13 14 1511 12 1716 1918 20
21
PF-20T / PF-50T Bass Guitar Amplifier
11
Changing the Tubes
Tubes wear out in direct proportion to how often and how hard you play your amplifier. Power tubes
should be checked at least once a year – more frequently if you use the amplifier nearly every day. When
power tubes wear out, the amplifier will begin to grow weak, lack punch, fade up and down, or lose highs
and lows. Power tubes work together in a push/pull configuration and should be replaced at the same
time with matched or balanced tubes. Your dealer can recommend the best replacement tubes for your
amplifier.
Preamp tubes aren’t worked as hard as power tubes and typically last longer. When a preamp tube wears
out, the amplifier may squeal, get noisy, lose gain and sensitivity, or just quit working. A service center
can determine which tube(s) may need replacing.
To get to the tubes in the PF-20T / PF-50T, the top screen must be removed first.
Qualified service persons may follow these steps to change the tubes:
• Turn the amp off, unplug it and let it cool for at least 5 minutes.
• Remove the screws which hold the perforated metal screen to the top of the chassis [Figure A].
• Set the perforated metal screen aside.
• Using a soft cloth, grasp the tube as closely to the base as possible and gently work POWER
it out of its socket by rocking it slightly back and forth as you lift up on it [Figure B].
NOTE: The retainers at the base may be spread apart to help remove the tube.
NOTE: The PF-50T has a 12AU7 Tube, but it is removed / attached similarly to the Power
Preamp Tubes (instructions below).
• Using a soft cloth, carefully replace the tubes by handling them as closely to the base POWER
as possible and firmly pressing down into the tube sockets.
• Grasp the tube retainer at its top, push down and twist left [counter-clockwise] until the PREAMP
tabs line up with the notches and lift up on it to remove [Figure B].
• Using a soft cloth, grasp the tube as closely to the base as possible and gently work PREAMP
it out of its socket by rocking it slightly back and forth as you lift up on it.
• Using a soft cloth, carefully replace the tube by handling it as closely to the base PREAMP
as possible. Line up the connector pins with the socket, then press down into the tube socket
to lock the tube into place.
• Replace the perforated metal screen and screws.
• Power up the amplifier and let it sit for at least 20 minutes. Bias the amplifier as directed
on the next page.
Figure B [PF-50T]
Preamp Tubes
Power Tubes
Figure B [PF-20T]Figure A

Product specificaties

Merk: Ampeg
Categorie: Niet gecategoriseerd
Model: PF-20T

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