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Average Price: $499

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Description

Step back in time with the Ampeg B25B Head from the 70s, a vintage treasure that bass enthusiasts and collectors alike will appreciate. This bass amplifier head is a classic piece of gear, offering a warm, rich tone that is reminiscent of the golden era of rock. Known for its simplicity and robust construction, the B25B delivers 50 watts of pure tube power, providing you with that sought-after vintage sound that modern replicas strive to emulate.

This amp head is equipped with two 7027 power tubes, allowing it to push your bass lines with a natural, dynamic feel. The straightforward control panel features volume, treble, and bass knobs, making it easy to dial in your sound without the distraction of overly complex settings. Perfect for small to medium-sized venues or studio recording, the Ampeg B25B Head gives you the authentic tone that made Ampeg a household name among bass players.

Whether you’re looking to capture that classic rock vibe or add a touch of vintage character to your modern setup, the Ampeg B25B Head is a reliable and characterful choice. Its durable design and timeless sound continue to inspire and resonate with musicians around the world.

Key Features:

  • 50 watts of tube power
  • Two 7027 power tubes
  • Simple control panel with volume, treble, and bass knobs
  • Vintage 1970s design and construction
  • Ideal for small to medium venues and studio use

Product specs

Brand Ampeg
Model B-25-B 2-Channel 55-Watt Bass Head
Finish Black
Year 1969 - 1980
Made In United States
Categories Bass Heads
Color Family Black
Direct Output No Direct Output
Electronics Tube
Impedance 16 ohms
Number of Channels 2 Channels
Number of Inputs 4 Inputs
Output Power (Watts) 55
Power Tube Type 6L6
Reverb None

FAQs

What are the core tonal characteristics of the Ampeg B25B Head 70's?

The Ampeg B25B Head 70's is known for its warm, vintage tube tone with a classic Ampeg sound, characterized by rich mids and smooth lows. It's ideal for players seeking a retro sound reminiscent of the late 60s and 70s.

Is the Ampeg B25B Head 70's suitable for live performances?

With its 55-watt output, the Ampeg B25B Head 70's is suitable for small to medium-sized venues. However, for larger gigs, additional amplification or PA support might be necessary to ensure adequate volume.

What type of power tubes does the Ampeg B25B Head 70's use?

The Ampeg B25B Head 70's utilizes 6L6 power tubes, which contribute to its classic warm and smooth tonal characteristics, making it a favorite for bassists seeking a vintage sound.

Does the Ampeg B25B Head 70's have any built-in reverb?

No, the Ampeg B25B Head 70's does not feature built-in reverb. Users may need to use external effects pedals or units to add reverb to their sound.

How many channels and inputs does the Ampeg B25B Head 70's offer?

The Ampeg B25B Head 70's features two channels and four inputs, allowing for versatile connectivity options and the ability to accommodate multiple instruments or setups.

Jerk of All Trades

Jerk of All Trades

Ampeg B25B

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Ampeg B25B

Jerk of All Trades

Jerk of All Trades

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Ampeg B25B Head 70's.

Features and functionality

  • It's noted that the B25B borrows its power amp design from the B18N but uses a 12AX7-based preamp instead of the octal 6SL7 design.

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  • The B25 lacks the SVT's active midrange circuit, and instead uses a simple James bass/treble EQ.

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  • The B25 is noted for being brighter overall than the classic B15 sound.

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Setup and maintenance

  • Owners recommend using a dummy plug to manage the amp's speaker switching for 8-ohm operation, although some prefer rewiring the windings to separate jacks.

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  • Servicing is advised for older units, including a recap to ensure the power supply is up to spec.

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Mods and upgrades

  • The cathode bypass cap on the PI is a less-common value, with Sprague offering a suitable 120u/75V replacement.

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  • Fliptops is recommended for sourcing the hard-to-find 30uf/600V caps needed for maintenance.

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  • Owners have modified the B25's output to separate jacks for 8 and 16 ohm loads by moving NFB and safety load connections.

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Comparisons

  • The B25 is compared to channel 2 of the vintage SVT, with the SVT having more push at similar settings.

    Source

4.5 out of 5

Based on 1 Review and 3 Ratings

5 star
4 star
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1 star
jimmarchi1

excellent small bass amps

the B25B is a B25 with a grounded cord stock. The transformers aren't robust and the rocker switches aren't durable, although not all B models have rockers, just later ones... the first one of these I had showed up with a dead power transformer and another one I owned blew an output transformer, so be aware and don't overpay. These amps sound great though. See my review of the B25.

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