Ampeg Portaflex B15-N (1968-1980) main image

Ampeg Portaflex B15-N (1968-1980)

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$23.90 to $2,000.00

5.0 (3)

1 Critic Review

All time low price

This product is Vintage or Discontinued

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Page last updated Jul 01, 2026

Pricing and availability

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5.0 (4)

$2,000.00 3 available Used

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4.5 (2)

$28.00 $23.90 $4.10 · All time low

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Description

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Introducing the Ampeg Portaflex B15-N – a legendary piece in the bass amplifier realm that marries vintage charm with contemporary functionality. This iconic bass amp stack is renowned for its distinctive warm tones and unmatched versatility, making it a favorite among bassists across genres. Whether you're laying down the groove in a smooth jazz ensemble or driving the rhythm in a rock band, the Portaflex B15-N stands as a testament to Ampeg's commitment to quality sound and durability. Its thoughtful updates, including the addition of Ultra High and Ultra Low switches, ensure that you can tailor your sound to perfection, from deep, rumbling lows to sparkling highs. Dive into the rich sonic landscape of the Ampeg Portaflex B15-N and experience the blend of historical excellence and modern innovation.

Key Features:

Ultra High and Ultra Low switches added for enhanced sound sculpting
Chrome-plated chassis replaced with aluminum for a sleek, durable finish
Speaker upgrades and back standby switch introduced for improved performance and convenience
Grounded power cable addition ensures safer operation and peace of mind during performances

Product specs

Brand	Ampeg
Model	B-15N Portaflex 25-Watt 1x15" Bass Combo
Finish	Black Vinyl
Year	1968 - 1980
Made In	United States
Categories	Bass Combo Amps, Guitar Combo Amps
Direct Output	No Direct Output
Electronics	Tube
Number of Channels	2 Channels
Number of Inputs	4 Inputs
Output Power (Watts)	25
Power Tube Type	6L6
Reverb	None
Speaker Configuration	1x15"

FAQs

What kind of music genres is the Ampeg Portaflex B15-N best suited for?: The Ampeg Portaflex B15-N is renowned for its warm, vintage tube tone, making it ideal for jazz, blues, and classic rock genres where a rich, smooth bass sound is desired.
Does the Ampeg Portaflex B15-N have enough power for live performances?: With 25 watts of power, the Ampeg Portaflex B15-N is best suited for studio use or small venue performances, where its vintage tone can be appreciated without the need for high volume levels.
How does the Ampeg Portaflex B15-N compare to modern bass amplifiers?: The Ampeg Portaflex B15-N offers a distinct vintage tube sound with a single 15-inch speaker, which is different from modern amps that often emphasize higher power and more features, making it a unique choice for those seeking classic tone.
What is the speaker configuration of the Ampeg Portaflex B15-N?: The Ampeg Portaflex B15-N features a 1x15" speaker configuration, which contributes to its deep, resonant bass response, perfect for traditional bass tones.
Does the Ampeg Portaflex B15-N have any built-in effects?: The Ampeg Portaflex B15-N does not include built-in effects like reverb, focusing instead on delivering a pure, vintage tube sound.

Reviews

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PROS

Vintage Ampeg tube tone unmatched by others
Ideal for achieving classic cts speaker cone distortion
Dependable and portable, suitable for sessions and gigs
Perfect for playing iconic songs with authentic sound
Offers a unique sweet spot for tone at moderate levels

CONS

Lacks the power for very loud genres or to compete with loud instruments

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Ampeg Portaflex B15-N (1968-1980).

Features and functionality

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The B15-N is a 60-watt amp, loud enough for most needs, and can be mic'd for larger venues.
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This model features a single 15" speaker, and some owners enjoy it with a JBL speaker for enhanced sound.
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The PF-115HE cabinet is praised for its flip-top design, although it lacks a port, which some users would prefer for enhanced sound dynamics.
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Comparisons

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Unlike Fender bass amps, the Ampeg B15 is noted as a studio standard for bass recording, maintaining its iconic status over the years.
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Setup and maintenance

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Early B15 and B12 models had a potentially dangerous standby setup through the speaker cable, which later models and conversions to 1/4" cables resolved.
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Owners suggest verifying schematics for older Ampeg models, as discrepancies can lead to issues when changing tube types, such as from 6L6s to 7027s.
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Expect to spend $100-150 for a cap job if it hasn't been serviced recently; bias check is necessary for tube changes due to fixed bias design.
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Mods and upgrades

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Some owners suggest using a Broughton Low + High Pass Filter pedal to optimize speaker efficiency and enhance potential volume.
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Owners experiment with JBL, Eminence, CTS, and Altec speakers for various tonal flavors.
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User experience

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Owners report that the PF-500 head maintains a characteristically "Ampegy" tone with a solid state design, closely resembling tube sound quality.
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Owners report distinctive tone perfect for old school R&B, country, and blues, but may distort too quickly for live use with a drummer.
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Build quality

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Some owners faced top rattling issues with the PF-115HE cabinet, resolved by applying new weather stripping for a snug fit.
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Vintage models may suffer from rattling issues at certain notes due to gaskets or shock mounts.
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