Reverb Tank - Mod® 4BB3C1D, Long Decay, 2-Spring

Mod Electronics
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Reverb Tank - Mod® 4BB3C1D, Long Decay, 2-Spring

In Stock
  • Replaces: 4BB3C1D
  • Solid, sturdy construction
  • Type: Long (2 Spring) tank
  • Decay: long decay
  • Input: 150 Ω
  • Output: 2,250 Ω
  • Connectors: Input insulated/output grounded
  • Locking: No lock
  • Mounting: Vertical/connectors down

Compatible amps include Marshall™ DSL60, TSL60, DSL100, TSL100, DSL201, DSL401, TSL122.

The Mod Electronics Reverb Tanks are high quality upgrade units. Some of the major differences between the Mod®s and other reverb tanks are that the Transducers are wired directly to their respective RCA jacks as opposed to current production tanks where Transducers are connected by a detachable plug to their respective RCA jacks. This makes the tanks less receptive to any outside interference. The original Hammond Accutronics tanks from the 1960s were also wired directly to their respective RCA jacks. In addition, very close attention has been paid to the spacing and size of the lamination of the Transducers resulting in a more vintage like tone.

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

Item ID:
Input Impedance:
Number Of Springs:
Output Impedance:
Tank Length:
RoHS Compliant
Product Measurements by Type
Connectorsinput insulated, output grounded
Decay Timelong (2.75 to 4.0 s)
Grommet Hole Diameter0.2 in.
Input Impedance150 Ω
Item Height1.5 in.
Item Length16.75 in.
Item Width4.25 in.
Mounting Hole Center to Center A8.75 in.
Mounting Hole Center to Center B3.75 in.
Mounting Planevertical, connectors down
Output Impedance (Zout)2.25 kΩ
Thickness0.04 in.
Packaging Information
Packaging Dimensions17 in. × 5 in. × 3 in.
Weight (Packaging)1.75 lbs.

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Questions and Answers

Click each question to see its answers.
Asked by RCW8AA on January 9th, 2018.
January 10th, 2018
Staff Member
You are correct in saying that the difference is the mounting plane indicated by the "B" is mounted horizontally, while the "D" is mounted vertically. The stock photo on this listing does not represent the way it is intended to be mounted.
Asked by ryanryzenga on January 19th, 2018.
Matt H
January 25th, 2018
From our limited resources the 4BB3C1D should work with the DSL 50.
Asked by Anonymous on June 23rd, 2018.
Matt H
June 25th, 2018
Unfortunately we do not have any information on that particular Marshall amp. Send us an email and we will try to help you find the correct tank at: [email protected]
Asked by Anonymous on January 10th, 2022.
January 10th, 2022
Staff Member
Generally, they are a flat piece of metal bent into a "U" shape, but we do not offer them at this time.

Product Reviews

5.00 out of 5 based on 7 reviews
Sonic Mods 8 - April 7th, 2022
5 out of 5

Fast delivery. Great product. Great customer service.

Ryan Y. - June 4th, 2021
5 out of 5

Sounds Great, has a nice long tail, very lush sounding versus the old unit it replaced.

Ricky Parish - November 28th, 2019
5 out of 5

In this world of sound, getting the right tone is vital. Life is too short for BAD Tone!!! I purchased the reverb tank at amplified parts to replace the one in my Marshall JCM2000. It came to my studio in 2 days! Thanks to the prompt service from this company, my amp sounds amazing!!! I would highly recommend this company for all your amplifier parts.

Steven Montgomery - October 15th, 2018
5 out of 5

Just put this tank in my TSL100 today. It sounds warmer, more lush and less boingy than the Accutronics reverb tank. Very good, easy and inexpensive mod for your amplifier. Very much worth it.

Jonathan Campagna - February 12th, 2017
5 out of 5

This can blows away the original unit in the TSL. Much more luscious sounding, and less "springy". Probably the best sub $20 mod you can make to the amp. It's just SO good!

Tedd Jensen - August 18th, 2015
5 out of 5

I like it.

Kurt - April 17th, 2013
5 out of 5

This 4BB3C1D was purchased as a replacement unit for a Marshall DSL401.
The tone is very good and no difference could be detected from the Accutronics model.
The unit size and mounting holes are identical to the original so replacement was a snap.
An Excellent Price - A Great Value - Highly Recommended !