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Ampeg positioned the PF-500-U within its Portaflex line as an ultra-compact bass amplifier head rated at 500 watts. It was designed to deliver Ampeg's characteristic tone in a highly portable format, and Ampeg paired it with the PF Series flip-top cabinets to reference the styling of the original Portaflex instruments.
The unit delivers 300 watts RMS into 8 ohms and 500 watts RMS into 4 ohms, both measured at 3% THD. The tone stack offers Bass control at ±12 dB centred at 40 Hz, a Midrange control with five selectable centre frequencies (220 Hz, 450 Hz, 800 Hz, 1.6 kHz, or 3 kHz) with +10/−20 dB of cut and boost, and Treble at +15/−20 dB centred at 4 kHz. Maximum gain is 69 dB with tone controls centred, and the signal-to-noise ratio is 72 dB unweighted over a 20 Hz–20 kHz window. The head accepts both 100–120 VAC and 200–240 VAC at 50–60 Hz, drawing 125 watts from the mains in either range. At 3.1 × 14.0 × 10.8 inches and approximately 11.0 lb, the enclosure is purpose-built for transport.
Owners sourcing replacement components, verifying impedance matching for cabinet pairings, or diagnosing power-section issues should consult a qualified amplifier technician familiar with bass amplification.
Nothing in The Vault is for sale. These records exist so the instruments stay documented after the manufacturer moves on — and the most useful part of that record is what owners add to it.
The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
