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Ampeg positioned the PF-350-U as part of its Portaflex series — a line designed to carry the character of the original Portaflex format into a compact, touring-practical head format. The unit delivered 350 watts into a 4-ohm load and 250 watts into an 8-ohm load, and was paired by Ampeg with the PF Series flip-top cabinets to recreate the flip-top aesthetic of the classic Portaflex originals.
The PF-350-U's feature set centred on practical stage and studio utility: a built-in limiter, an effects loop, and a direct output. The tone stack offered substantial range — treble cut and boost of 25 dB and 19 dB respectively at 8 kHz, bass boost of 14 dB and cut of 12 dB at 40 Hz, and a midrange control centred at 500 Hz. Maximum gain with tone controls centred reached 64 dB. Signal-to-noise ratio was rated at 75 dB unweighted across the full 20 Hz–20 kHz band. The unit ran on both 100–120 VAC and 200–240 VAC supplies at 50–60 Hz, drawing approximately 100 watts. At 7.8 lb / 3.5 kg, the head measured 2.7 in high by 10.8 in wide by 10.7 in deep.
Owners seeking speaker cable specifications, cabinet impedance matching guidance, or effects loop level compatibility should consult a qualified guitar or bass technician with the unit's documentation to hand.
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
