Ampeg PF-20T

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The legendary tone and portability of the all-tube Ampeg Portaflex amplifiers is faithfully reproduced in the PF-20T. This all-tube Portaflex head provides a harmonically rich and studio-worthy 20 watts of pure Ampeg tone to satisfy the most discerning bass player. Featuring simple user-adjustable bias adjustment for easy tube replacement and pre-amp and transformer balanced direct outs for maximum versatility. Plus, no speaker load is required for silent recording or even use as a dedicated tube DI. Pair it with the PF-112HLF for the ultimate compact all-tube bass rig.

Specs

Controls

Gain
This control adjusts the input level of the signal reaching the preamp
Bass
Use to adjust the low frequency level of the amplifier. The low frequency output is flat at the center position.
Mid
Use to adjust the midrange frequency level of the amplifier. The midrange frequency output is flat at the center position. Rotate the control counter-clockwise for a “contoured” sound (more distant, less midrange output), or clockwise for a sound that really cuts through
Treble
Use to adjust the high frequency level of the amplifier. The high frequency output is flat at the center position.
Volume
Use to control the overall output level. It affects the Speaker Outputs and the Preamp Output.

Toggle switches

Pre/Post EQ
Thesignalatthe 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.
Ground Lift
When this switch is engaged, it connects the ground connection to help reduce residual hum and buzz sometimes picked up in the signal cables.

Outputs

Preamp Balanced Line Out
This signal may be used to feed an external power amplifier, mixing console, interface, or house PA system.
Transformer Balanced Line Out
This signal may be used to feed an external power amplifier, mixing console, interface, or house PA system.
Speaker output
This mono, 1/4" TS Output jack supplies speaker-level power to the speaker cabinet. The rated power output is 20 Watts RMS into 4 or 8 Ω. Make sure the total speaker impedance load is 4 Ω or greater. For example, you could connect: • Two 16 Ω speakers in parallel = 8 Ω • Two 8 Ω speakers in parallel = 4 Ω

Power and Ohm

RMS Power Output:
20W @ 4 or 8 Ω
Preamp:
All-tube 2 x 12AX7
Power Amp:
All-tube 2 x 6V6

Mechanics

Dimension:
7.3 x 13.0 x 10.4 in / 185 x 330 x 264 mm
Weight:
15.2 lb / 6.9 kg
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