Reverb Tank - MOD®, 4BB3C1B, Long Decay, 2-Spring

Reverb Tank - MOD®, 4BB3C1B, Long Decay, 2-Spring

Mod Electronics
Reverb Tank - MOD®, 4BB3C1B, Long Decay, 2-Spring image 1
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  • Replaces: 4BB3C1B
  • 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: Horizontal/open side down

Compatible amps include Fender® Blues Deluxe (original version), Blues Deville (original version), London Reverb, Studio Lead, Harvard Reverb II, Showman 115 (80’s version), Rivera™ Rake, Jake Studio Combo, and Fandango models, Laney™ VC30, Crate™ V-32 Palomino.

The MOD® 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.

RoHS Compliant
Item ID:
Mod Electronics
Input Impedance:
Number Of Springs:
Output Impedance:
Tank Length:
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 Planehorizontal, open side down
Output Impedance (Zout)2.25 kΩ
Thickness0.04 in.
Packaging Information
Packaging Dimensions17 in. × 5 in. × 3 in.
Weight (Packaging)1.75 lbs.

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Specifications, Files, and Documents

Sound Samples:

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on April 12th, 2017.
Matt H.
April 12th, 2017
Staff Member
From our brief research, The 79-201-02 is a replacement for an 8BB2C1A reverb tank. This 4BB3C1B will have a different mounting plane and will need to be mounted open side down. The original tank was mounted open side up. If you are looking for a direct replacement we recommend the 8BB2C1A.
Asked by Anonymous on November 22nd, 2017.
Matt H.
November 22nd, 2017
Staff Member
Yes but you will need to make sure you have enough room for the new tank as it is 16.75" in length. If you do not have enough room, you could use an 8BB3C1B. This is the same size as the 1BB3C1B but with three springs instead of two. Do a search for SKU: P-RMOD-8BB3C1B.
Asked by Anonymous on February 12th, 2018.
Matt H.
February 13th, 2018
Staff Member
Are you sure about the 'S' in 4BB3S1D? Could it be a B? We are not familiar with 4BB3S1D but all thing being equal, as long as the second and third character are the same then the tanks should be compatible.
Asked by Anonymous on April 23rd, 2019.
April 24th, 2019
Staff Member
Yes, the input and output impedance match, the only differences between the two tanks is the 4BB3C1B will have a long decay time (the 4BB2C1A having medium decay) and the 4BB3C1B is meant to have the open side down where the 4BB2C1A is meant to have the open side up.
Asked by Anonymous on September 18th, 2019.
September 19th, 2019
Staff Member
The input resistance measured 28 ohms.

Product Reviews

5.00 out of 5 based on 4 reviews
- November 14th, 2020
5 out of 5

Replaced the short tank in my Rivera with this longer tank.Sounds better smoother,deeper.

- September 18th, 2017
5 out of 5

I replaced the reverb tank after the original one quit working. I installed the MOD, 4BB3C1B
In the Fender Blues Deluxe, and the sound was great, even better than the accutronics tank.
Great product, and excellent service from Antique Electronic Supply.

- September 13th, 2015
5 out of 5

Very well-made replacement tank! Returned clarity and harmonics to the wet signal! Acoustic-decoupling grommets provide great isolation to prevent hypersensitive "thunder!"

HIGHLY recommend for anyone considering a reverb tank upgrade/replacement!

- October 15th, 2014
5 out of 5

works great ... just like a new amp again