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Reverb Tanks

Spring reverb tanks are used to create a unique reverberation effect in guitar amps and organs. The reverberation effect is created when an audio signal created by a transducer is sent through one or more springs, the movement of the springs is then converted back into an audio signal by another transducer at the other end, creating the unique sound. Not sure which tank you're looking for or what a 4AB3C1B is? Check out our spring reverb calculator to help you determine what these tank designations mean!

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P-RK-4AB3C1CReverb Tank - Accutronics, 4AB3C1C, Long Decay, 2-Spring

Long (2 Spring) tank, long decay, 8Ω in / 2,250Ω out. Input insulated/output grounded connectors. Vertical/connectors up mounting. Compatible amps include Fender® stand alone reverb and original ’63 Reverb. Also used in Marshall™, and Ampeg™ amps.


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P-RTAD-4AB3C1BReverb Tank - Tube Amp Doctor, 4AB3C1B, Long Decay, 2-Spring
  • 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


"TAD redefines Spring Reverberation. When the manufacturing of Accutronics Reverb cans in the USA has been announced to close down in 2008 TAD started the research for an own high quality production of the classic spring reverberation units. The goal was to create a drop-in replacement bringing back that stunning reverb sound that Fender made so popular since the early 1960s.



The TAD Reverb Cans achieve this goal and even more: deep and smooth reverb, no fluttering but wide frequency response with airy top end instantly inspiring to enjoy guitar playing. The rock solid mechanical design assures a very dependable and consistent quality performance exceeding any expectation. A drop-in replacement and upgrade as well for vintage as for modern reverb cans by size, performance and tone."



-Tube Amp Doctor


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P-RMOD-4AB1C1BReverb Tank - MOD®, 4AB1C1B, Short Decay, 2-Spring

Long (2 Spring) tank, short decay, 8Ω in / 2,250Ω out. Input insulated/output grounded connectors. Horizontal/open side down mounting. MOD® Reverb Tanks are high quality upgrade units.


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P-RBAG-17LNR-AReverb Tank Liner - for 17" Bag, Handmade Black Tolex

Insert bag for greater isolation. Liner for 17" tanks to make a 2-ply bag.



Note: This product is a liner for a reverb bag. It is not meant to be used as a reverb bag by itself.

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P-RMOD-4FB3D1BReverb Tank - MOD®, 4FB3D1B, Long Decay, 2-Spring

Long (2 Spring) tank, long decay, 1,475Ω in / 2,250Ω out. Input insulated/output insulated connectors. Horizontal/open side down mounting. MOD® Reverb Tanks are high quality upgrade units.


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P-RMOD-8BB3C1BReverb Tank - MOD®, 8BB3C1B, Long Decay, 3-Spring

Short (3 Spring) tank, long decay, 190Ω in / 2,575Ω out. Input insulated/output grounded connectors. Horizontal/open side down mounting. MOD® Reverb Tanks are high quality upgrade units. Compatible amps include Fender Harvard Reverb II and Yale Reverb amps (short tank).


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P-RK-9AB3C1BReverb Tank - Accutronics, 9AB3C1B, Long Decay, 3-Spring

Long (3 Spring) tank, long decay, 10Ω in / 2,575Ω out. Input insulated/output grounded connectors. Horizontal/open side down mounting. Counter wound spring, coupled and placed in parallel, combine to create a full, rich reverb effect.


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P-RBTDR-2V-XReverb Module - Accutronics, Digi-Log, vertical mount, mini

A great digital reverb sound that easily replaces a spring reverberation unit. Stereo outputs may be summed for mono operation. Simple interface requires only input, output, +5V, and ground.


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P-RAMC2EF3Reverb Tank - Accutronics, AMC2EF3, Long Decay, 2-Spring

Accutronics mini-size spring reverb tank. Long decay, 2-spring, 600Ω input impedance, 1500Ω output impedance. 4.88" x 1.73" mounting centers.


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P-RMOD-4DB2C1DReverb Tank - MOD®, 4DB2C1D, Medium Decay, 2-Spring

Long (2 Spring) tank, medium decay, 250Ω in / 2,250Ω out. Input insulated/output grounded connectors. Vertical/connectors down mounting. MOD® Reverb Tanks are high quality upgrade units. Compatible amps include Marshall™ JCM800 (select models) Marshall™ Valvestate (select models). Can also be used as a replacement/upgrade for the smaller tank in Fender® FM210 and 212 models.


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