Ampeg PF-20T, PF50T Users Manual
PF-20T and PF-50T
Bass Guitar Amplifiers
Owner’s Manual
IMPORTANT SAFETY INSTRUCTIONS
PF-20T / PF-50T Bass Guitar Amplifier
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings.
Install in accordance with the manufacturer’s
instructions.
8. Do not install near any heat sources such
as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce
heat.
9. Do not defeat the safety purpose of the
polarized or grounding-type plug. A polarized
plug has two blades with one wider than the
other. A grounding-type plug has two blades
and a third grounding prong. The wide blade
or the third prong are provided for your safety. If the provided plug does not fit into your
outlet, consult an electrician for replacement
of the obsolete outlet.
10. Protect the power cord from being
walked on or pinched particularly at plugs,
convenience receptacles, and the point
where they exit from the apparatus.
11. Only use attachments/accessories
specified by the manufacturer.
12. Use only with a cart,
stand, tripod, bracket, or table
PORTABLE CART
WARNING
specified by the manufacturer,
or sold with the apparatus.
When a cart is used, use
caution when moving the
cart/apparatus combination
to avoid injury from tip-over.
13. Unplug this apparatus during lightning
storms or when unused for long periods
of time.
14. Refer all servicing to qualified service
personnel. Servicing is required when the
apparatus has been damaged in any way,
such as power-supply cord or plug is
damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does
not operate normally, or has been dropped.
15. This apparatus shall not be exposed to
dripping or splashing, and no object filled
with liquids, such as vases or beer glasses,
shall be placed on the apparatus.
16. Do not overload wall outlets and
extension cords as this can result in a risk
of fire or electric shock.
17. This apparatus has been designed with
Class-I construction and must be connected
to a mains socket outlet with a protective
earthing connection (the third grounding
prong).
18. The MAINS plug or an appliance
coupler is used as the disconnect device,
so the disconnect device shall remain readily
operable.
19. For the terminals marked with symbol
of “ ” may be of sufficient magnitude
to constitute a risk of electric shock. The
external wiring connected to the terminals
requires installation by an instructed person
or the used of ready-made leads or cords.
WARNING — To reduce the risk of fire or electric shock, do not
expose this apparatus to rain or moisture.
Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan.
Apparatet må tilkoples jordet stikkontakt.
Apparaten skall anslutas till jordat uttag.
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RISK OF ELECTRIC SHOCK! DO NOT OPEN!
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT
REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL.
The lightning flash with arrowhead symbol within an equilateral
triangle means “electric shock hazard”. It is intended to alert
the user to the presence of uninsulated “dangerous” voltage
within the product enclosure, that may be of significant
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle means
“Warning/Caution!”. It is intended to alert the user of the
presence of important operating and maintaining (servicing)
instructions in the literature accompanying the appliance.
CAUTION
PF-20T / PF-50T Bass Guitar Amplifier
NOTE: This equipment has been tested
and found to comply with the limits for a
Class B digital device, pursuant to part 15
of the FCC Rules. These limits are designed
to provide reasonable protection against
harmful interference in a residential
installation. This equipment generates,
uses, and can radiate radio frequency
energy and, if not installed and used in
accordance with the instructions, may
cause harmful interference to radio
communications. However, there is no
guarantee that interference will not occur
in a particular installation. If this equipment
does cause harmful interference to radio or
television reception, which can be determined
by turning the equipment off and on,
the user is encouraged to try to correct
the interference by one or more of the
following measures:
• Reorient or relocate the receiving
antenna.
• Increase the separation between
the equipment and the receiver.
• Connect the equipment into an outlet
on a circuit different from that to which
the receiver is connected.
• Consult the dealer or an experienced
radio/TV technician for help.
CAUTION: Changes or modifications to this
device not expressly approved by LOUD
Technologies Inc. could void the user’s
authority to operate the equipment under
FCC rules.
This apparatus does not exceed the
Class A/Class B (whichever is applicable)
limits for radio noise emissions from digital
apparatus as
regulations of the Canadian Department
set out in the radio interference
of
Communications.
Exposure to extremely high noise levels may
cause permanent hearing loss. Individuals
vary considerably in susceptibility to
noise-induced hearing loss, but nearly
everyone will lose some hearing if exposed
to sufficiently intense noise for a period of
time. The U.S. Government’s Occupational
Safety and Health Administration (OSHA)
has specified the permissible noise level
exposures shown in the following chart.
According to OSHA, any exposure in excess
of these permissible limits could result
in some hearing loss. To ensure against
potentially dangerous exposure to high
sound pressure levels, it is recommended
that all persons exposed to equipment
capable of producing high sound pressure
levels use hearing protectors while the
equipment is in operation. Ear plugs or
protectors in the ear canals or over the
ears must be worn when operating the
equipment in order to prevent permanent
hearing loss if exposure is in excess of
the limits set forth here:
Duration, per
day in hours
8 90
6 92
4 95
3 97
2 100
1.5 102
1 105
0.5 110
0.25 or less 115
Sound
Level dBA, Slow
Response
Typical Example
Duo in small club
Subway Train
Very loud classical music
The boss screaming at his minions about manual deadlines
Loudest parts at a rock concert
Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household waste,
according to the WEEE directive (2012/19/EU) and your national law. This product should be handed over to an authorized
collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type of waste could have
a possible negative impact on the environment and human health due to potentially hazardous substances that are generally
associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the effective
usage of natural resources. For more information about where you can drop off your waste equipment for recycling, please
contact your local city office, waste authority, or your household waste disposal service.
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TABLE OF CONTENTS
Important Safety Instructions .............................................. 2-3
Table Of Contents .................................................................4
Introduction ..........................................................................4
PortaFlex Series Features ......................................................5
PortaFlex Series Front Panel Features ....................................6
PortaFlex Series Rear Panel Features .................................. 7-8
Some Suggested Settings .....................................................9
Favorite Settings .................................................................10
Changing the Tubes ............................................................11
Setting Tube Bias ................................................................12
PF-20T Technical Specifications and Block Diagram ..............13
PF-50T Technical Specifications and Block Diagram ..............14
Service Information .............................................................15
Introduction
PF-20T / PF-50T Bass Guitar Amplifier
The Portaflex series bass amplifiers brought legendary Ampeg tone in powerful
lightweight design that bass players around the world, from beginners to professionals,
have made the most popular bass amplifiers in history. The PF-20T and PF-50T deliver
legendary Ampeg all-tube tone and warmth in the same portable, powerful and affordable
design.
Designed to be compact and match perfectly with existing Portaflex cabinets,
the PF-20T and PF-50T are perfect for small to medium sized shows, studio recording
or even a rehearsal studio. Combined with the PF-112HLF compact cabinet, you have
the ultimate portable tone powerhouse.
Like all Ampeg products, your Portaflex series bass amplifier is designed by musicians
and built using only the best of components. Each amp is tested to confirm that it meets
our specifications, and we believe that this amp is the absolute best that it can be.
In order to get the most out of your new amp, please read this manual before
you begin playing. Best of luck in all of your musical endeavors!
And thank you for choosing Ampeg.
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PF-20T / PF-50T Bass Guitar Amplifier
PortaFlex PF-20T / PF-50T Features:
• RMS power output:
20W @ 4 or 8 ohms [PF-20T]
50W @ 4 or 8 ohms [PF-50T]
• Preamp: All-tube 2 x 12AX7
• Power amp:
All-tube 2 x 6V6 [PF-20T]
All-tube 1 x 12AU7, 2 x 6L6 [PF-50T]
• 0 dB and -15 dB inputs [PF-50T]
• Tone controls: Bass, Mid, Treble
• Mid-tone control: 5-position [PF-50T]
• Ultra Hi/Lo boosts [PF-50T]
• Input gain control
• Preamp balanced line out
• Pre/Post EQ
• Ground lift
• Transformer balanced line out
• Ground lift
• No speaker load required
• User-adjustable bias control
• Dimensions:
7.3 x 13.0 x 10.4 in / 185 x 330 x 264 mm [PF-20T]
7.3 x 13.9 x 10.4 in / 185 x 353 x 264 mm [PF-50T]
• Weight:
15.2 lb / 6.9 kg [PF-20T]
19.4 lb / 8.8 kg [PF-50T]
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