Reverb Tank - Mod® 4BB2A1B, Medium Decay, 2-Spring

Mod Electronics
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Reverb Tank - Mod® 4BB2A1B, Medium Decay, 2-Spring

In Stock
  • Replaces: 4BB2A1B
  • Solid, sturdy construction
  • Type: Long (2 Spring) tank
  • Decay: medium decay
  • Input: 150 Ω
  • Output: 2,250 Ω
  • Connectors: Input grounded/output grounded
  • Locking: No lock
  • Mounting: Horizontal/open side down

Compatible amps include Music Man™ amps as well as the Mesa Boogie™ F-30 and F-50 models.

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 grounded, output grounded
Decay Timemedium (1.75 to 3.0 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 Planehorizontal, open side down
Output Impedance (Zout)2.25 kΩ
Thickness0.04 in.
Packaging Information
Packaging Dimensions17 in. × 5 in. × 3 in.
Weight (Packaging)1.3558 lbs.

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Questions and Answers

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Asked by Anonymous on May 15th, 2019.
May 17th, 2019
Staff Member
All of the technical specs are identical aside from the way the two tanks are mounted, so it should work however, you may want to lay the open side down on the bottom of the cabinet for peak performance.
Asked by Anonymous on September 15th, 2019.
September 18th, 2019
Staff Member
Reverb tank tone is subjective and some may feel that is true while others may disagree. We have made a video series comparing a number of different tanks that you can view here:
Asked by Anonymous on September 21st, 2022.
September 22nd, 2022
Staff Member
Yes, MOD tanks do include grommets.

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