Reverb Tank - Accutronics, 4AB3C1B, Long Decay, 2-Spring

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Reverb Tank - Accutronics, 4AB3C1B, Long Decay, 2-Spring

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The industry standard for years, the Type 4 is still manufactured today using Hammond’s original design. Counter wound and coupled springs deliver superior mechanical performance and the classic sound that helped make the Fender Twin Reverb Amps famous.

  • Replaces: 4AB3C1B
  • Solid, sturdy construction
  • Type: Long (2 Spring) tank
  • Decay: long decay
  • Input: 8 Ω
  • Output: 2,250 Ω
  • Connectors: Input insulated/output grounded
  • Locking: No lock
  • Mounting: Horizontal/open side down

Compatible amps include tube reverbs from 1963-1990 such as the Princeton Reverb, Vibrolux Reverb, Deluxe Reverb, Super Reverb, Pro Reverb, Twin Reverb, Quad Reverb, Super Six Reverb, Vibrosonic Reverb. This also includes all reissue equivalents. Also includes Fender® ’63 Reissue Reverb Unit, Fender® Concert II, Mesa Boogie® MK2C plus other models, LAB® Series L5, L7, L9, Koch® Powertone I, B-52® AT-100. Also compatible with some speaker-driven, type F, vintage Ampeg® amps such as B12X, B12XY, Echo Jet, Echo Twin.

New production Accutronics tank.

Questions about reverb tanks? See our tech articles for more information.

Item ID:
Accu-Bell Sound Part Number:
Number Of Springs:
Tank Length:
RoHS Compliant
Connectorsinput insulated, output grounded
Decay Timelong (2.75 to 4.0 s)
Input Impedance8 Ω
Mounting Planehorizontal, open side down
Output Impedance (Zout)2.25 kΩ
Packaging Information
Packaging Dimensions17 in. × 5 in. × 2.5 in.
Weight (Packaging)1.3118 lbs.

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Product Reviews

4.86 out of 5 based on 7 reviews
Johnny B Goode - June 9th, 2024
5 out of 5

It's a great old-school reverb tank by Accutronics. Over the decades, the two-spring reverb has had that classic sound in many Fender Amps. I want to add that Amplified Parts is a very unique company dealing in many items one cannot find in other venues. And their customer service and quick shipping are a major plus.

Michael - May 14th, 2024
5 out of 5

Great reverb tank replacement fir 2003 Fender Deluxe Reverb. Amplified Parts shipped fast ad usual so I could led complete he repair quickly.

R Panch - November 28th, 2023
5 out of 5

Perfect replacement tank for my 1974 Twin Reverb. Reverb sounds 199% better now.

Edward Whitworth - October 21st, 2023
5 out of 5

Perfect replacement for my Crate VC50

Kas Nelson - January 15th, 2022
5 out of 5

Every time I buy something from Amplified Parts, I always get exactly what I was hoping for. In this case, the reverb tank went into a Vintage 1965 Super Reverb and it sounds wonderful. There is nothing like a real spring reverb when its working correctly. I will remember to shop Amplified Parts first when I need tubes or restoration parts. Great pricing, guick shipping and, the descriptions are accurate.

J Du Perron - January 8th, 2022
5 out of 5

Ordered as a replacement for a defective tank in a vintage Lab Series L7 amplifier. Easy fix and works like a charm...beautiful dripping reverb for that authentic surf and early rock n'roll music, or just a hint to musically elevate your tone! No issues with the workmanship. Definitely recommended.

NL - January 2nd, 2020
4 out of 5

Ordered as a replacement for my Princeton Reverb. Sounds lovely, definitely has the classic Fender character. Only giving four stars because both transducers were loose. Not a huge deal, nothing a drop of superglue couldn’t fix. Would recommend but check the transducers for movement before you install.