Ampeg PF-20T Watt All Tube Bass Head User Guide

Ampeg PF-20T Watt All Tube Bass Head

Technical Specifications

PF-20T

• Output Power Rating: 20W @ 8 ohms (10% THD), 20W @ 4 ohms (10% THD)
• Maximum Gain: 54 dB
• Power Requirements:
  • 120V AC, 60 Hz, 50W
  • 100V AC, 50-60 Hz, 50W
  • 220-240V AC, 50-60 Hz, 50W
• Size (H x W x D): 7.3 x 13.0 x 10.4 in / 185 x 330 x 264 mm
• Weight: 15.2 lb / 6.9 kg

PF-50T

• Output Power Rating: 50W @ 8 ohms (10% THD), 50W @ 4 ohms (10% THD)
• Maximum Gain: 66 dB
• Power Requirements:
  • 120V AC, 60 Hz, 90W
  • 100V AC, 50-60 Hz, 90W
  • 220-240V AC, 50-60 Hz, 90W
• Size (H x W x D): 7.3 x 13.9 x 10.4 in / 185 x 353 x 264 mm
• Weight: 19.4 lb / 8.8 kg

Product Usage Instructions

Getting Started

1. Read and understand the included Important Safety Instructions.
2. Ensure the power switch is off before making any connections.
3. Securely plug the line cord into the amplifier’s IEC connector and connect it to a grounded AC outlet.
4. Connect an instrument to the input jack with a 1/4 instrument cable and speaker cables to speaker cabinets with 1/4 TS.
5. Ensure the Standby switch is down [on].
6. With all volume controls off, turn the amplifier on by pressing the power switch to the on position and wait for 30 seconds.
7. Move the Standby switch up [off].
8. While playing the instrument, adjust the Gain and Volume knob to the preferred level.
9. Adjust the EQ knobs to taste.

Frequently Asked Questions

• What should I do if my amplifier is not powering on?
  • If your amplifier is not powering on, first check that the power switch is in the correct position and that the power cable is properly connected to a grounded outlet. If the issue persists, contact technical support for further assistance.
• Can I use speaker cabinets with different impedance levels when daisy-chaining?
  • No, it is recommended to use speaker cabinets with the same impedance levels when daisy-chaining to ensure optimal performance and avoid potential damage to the amplifier.

What’s in the Box

PF-20T or PF-50T Amplifier, Power Cable, and Quick Start Guide.

Hookup Diagrams

Standard Setup

PA/Recording Setup

Daisy Chaining

Front & Rear Panels ****

Front & Rear Panel Descriptions

1. 0 dB Input: Connect a passive instrument to this Input jack.
2. –15 dB Input: Connect an active instrument to this Input jack.
3. Gain: The Gain knob adjusts the signal sent to the preamplifier.
4. Ultra Hi / Ultra Lo Switches: Boosts high or low frequencies.
5. EQ Knobs: Boost or cut the level at certain frequencies to enhance the sound.
6. Frequency Select Knob: Selects the frequencies affected by the Midrange EQ knob.
7. Volume: Adjusts the overall output level.
8. Power Switch: Turns the power on/off.
9. Standby Switch: Turns the Standby on and off.
10. Power Connector: Input socket for power cable.
11. Fuse: Overload and AC line surge protection.
12. Bias: Controls and LEDs for user biasing.
13. Pre / Post Switch: Set the Balanced Out jack to Pre-EQ [engaged] or Post-EQ [disengaged].
14. Preamp DI Out: Feeds an external mixer or recording device.
15. Lift / Gnd: Connects the ground connection at the Balanced Line Out jack.
16. Transformer Balanced DI Output: Feeds an external mixer or recording device.
17. Speaker Output: 1/4″ TS output jack for connecting an external speaker cabinet.
18. Impedance Selector: Match the output impedance of the amp to the speaker(s).

Getting Started

1. Read and understand the included “Important Safety Instructions.”
2. Make sure the power switch is off before making any connections.
3. Push the line cord securely into the amplifier’s IEC connector and plug the other end into a grounded AC outlet. The amplifier may accept the appropriate voltage as indicated near the IEC connector.
4. Connect an instrument to the input jack with a 1/4″ instrument cable. Connect (non-shielded) speaker cables to speaker cabinets with 1/4″ TS.
5. Make sure the Standby switch is down [on].
6. With all volume controls fully off, turn the amplifier on by pressing the power switch to the on position. Wait 30 seconds.
7. Move the Standby switch up [off].
8. While playing the instrument, adjust the Gain and Volume knob to the preferred level.
9. Adjust the EQ knobs to taste

Technical Specifications

All specifications subject to change

WARRANTY AND SUPPORT

Visit WWW.AMPEG.COM to…

1. …identify WARRANTY coverage provided in your local market. Please keep your sales receipt in a safe place.
2. …retrieve a full-version, printable OWNER’S MANUAL (English only) for your product.
3. …REGISTER your product.
4. …CONTACT Technical Support, or call 818-575-3600.

www.ampeg.com

Yamaha Guitar Group, Inc. 26580 Agoura Road, Calabasas, CA 91302-1921 USA Part No. 40-00-0531 Rev. B

Contact

• Supplier’s Declaration of Conformity
• 47 CFR § 2.1077 Compliance Information
• Unique Identifiers: Ampeg PF-20T and PF-50T
• Responsible Party – U.S. Contact Information:
• Yamaha Guitar Group, Inc.
• 26580 Agoura Road
• Calabasas, CA 91302-1921
• 818-575-3600
• https://ampeg.com/

FCC Compliance Statement:

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and
2. this device must accept any interference received, including interference that may cause undesired operation.

There are various types of fuses, and replacing them with different types may cause malfunction, electric shock, or fire. Be sure to confirm you are replacing the correct fuse with electrical rating and specifications. Each number and symbol represent the following:

Example: T3AL250V

2021 Yamaha Guitar Group, Inc. All rights reserved. Ampeg, the Ampeg logo, and Portaflex are trademarks or registered trademarks of Yamaha Guitar Group, Inc. in the U.S. and/or other jurisdictions.

References

• Ampeg
• Ampeg

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