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Ampeg produced the PF-800-U as part of the Portaflex Series of bass amplifier heads. The unit delivered 800 watts of output power in an ultra-compact chassis, positioning it toward bassists requiring high output in a portable format within the Portaflex line.
The PF-800-U carried an all-tube preamp stage and offered extensive tonal control: bass adjustment of ±12 dB at 40 Hz, a midrange control with five selectable centre frequencies (220 Hz, 450 Hz, 800 Hz, 1.6 kHz, and 3 kHz) at up to +10/−20 dB, and treble at +15/−20 dB at 4 kHz. Maximum gain measured 71 dB with tone controls centred, and signal-to-noise ratio was rated at 74 dB unweighted across 20 Hz–20 kHz. The head was designed to accept dual-voltage mains supply, covering both 100–120 VAC and 200–240 VAC at 50–60 Hz, drawing 200 W from the wall at either voltage. The enclosure measured 3.1 × 15.0 × 10.8 inches and weighed 11.8 lbs, consistent with its Portaflex portability intent.
Owners requiring service, bias checks on the tube complement, or cabinet impedance matching should consult a qualified amplifier technician familiar with high-wattage bass amplifier heads.
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