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# Reverb Tank - MOD®, 4AB3C1B, Long Decay, 2-Spring

$21.15 Save 10% Originally:$23.50
In Stock
• 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.

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.

RoHS Compliant
SKU:
P-RMOD-4AB3C1B
Item ID:
003293
UPC/EAN:
797734820928
Brand:
Mod
Input Impedance:
Number Of Springs:
Output Impedance:
Tank Length:
 Connectors input insulated, output grounded Decay Time long (2.75 to 4.0 s) Grommet Hole Diameter 0.2 in. Input Impedance 8 Ω Item Height 1.5 in. Item Length 16.75 in. Item Width 4.25 in. Mounting Hole Center to Center A 8.75 in. Mounting Hole Center to Center B 3.75 in. Mounting Plane horizontal, open side down Output Impedance (Zout) 2.25 kΩ Springs 2 Thickness 0.04 in.
 Packaging Dimensions 17 in. × 5 in. × 3 in. Weight (Packaging) 1.75 lbs.
 Sound Sample - Drum Machine Clap All Models Sound Sample - Drum Machine Snare All Models Sound Sample - Quick Strum All Models Sound Sample - Stacatto All Models Sound Sample - Sustained Chord All Models Sound Sample - Tremolo Chords All Models

## Specifications, Files, and Documents

### Sound Samples:

Click each question to see its answers.
Asked by Anonymous on August 27th, 2015.
August 27th, 2015
Staff Member
Top Contributor
The construction of these MOD tanks is designed to sound as close as possible to vintage reverb tanks of the 60's.This tank would serve as a great upgrade to the stock unit in a Fender Twin.
October 2nd, 2015
Will this work in a 94 Fender Vibroking
Asked by Anonymous on November 14th, 2015.
November 17th, 2015
Staff Member
Top Contributor
You will want to determine several factors regarding your reverb circuit such as input/output impedance, mounting orientation,number of springs, etc. I would suggest visiting our tech corner for a full explanation of reverb tanks. I'll include the address below: https://www.amplifiedparts.com/tech_corner/spring_reverb_tanks_explained_and_compared
Asked by Anonymous on November 19th, 2015.
November 20th, 2015
Staff Member
Top Contributor
The MOD series tanks are designed to sound much closer to vintage sounding reverb tanks than other brands and their construction lends itself well to this goal. This will definitely be a great upgrade or replacement and should provide a nice lush reverb for your deluxe.
Asked by Anonymous on June 26th, 2016.
June 27th, 2016
It appears from doing a quick internet search, the JCM 900 uses a 8DB2C1B, and the JCM 2000 uses a 4BB3C1D. You might want to confirm these numbers by looking at your reverb tanks. Most tanks will have an 8 character number on them.
Asked by Anonymous on July 19th, 2016.
July 19th, 2016
Most MOD owners feel that these reverb tanks are the most accurate to the original tanks found in vintage Fender amps. In most cases this would be considered an upgrade.
Asked by Anonymous on September 13th, 2016.
September 13th, 2016
Hi, from our limited research it appears that you need an 8EB2C1B for your Valveking. I would confirm this by looking at the number on your tank.
Asked by Anonymous on November 15th, 2016.
November 15th, 2016
Yes, this will work in your '65 Princeton Reverb.
Asked by Anonymous on March 16th, 2017.
March 16th, 2017
As long as the second and third character match (AB) you can play around with the other options. The first character will describe the tank size and number of springs. The fourth character represents your decay time and comes in three different types (short, medium, and long). For more information please see our reverb tank article in the tech corner above.
Asked by Anonymous on April 4th, 2017.
April 6th, 2017
From our limited research it appears that the 4AB3C1B was the original tank in your amp.
Asked by Anonymous on April 22nd, 2017.
April 25th, 2017
As long as the second and third characters (AB) in 4AB3C1B match with the tank in your amp, you can play around with the other numbers. For example, if you wanted a long tank with 3 springs instead of two, you would want a 9AB3C1B.
Asked by Anonymous on August 10th, 2017.
August 10th, 2017
We simply do not have the resources or reference materials to determine what type of reverb tank your Sunn needs. If you have the original tank, you will want to see if there is an alpha number code on it. If you can get that information to us we might be a able to help you out.
Asked by Anonymous on September 15th, 2017.
September 19th, 2017
Yes, we believe that the MOD series of reverb tanks are an improvement. These tanks are made as close as possible to the original USA made Accutronics tanks.
Asked by Anonymous on October 17th, 2017.
October 17th, 2017
The 4EB3C1B is the proper replacement for your Hot Rod Deluxe.
Asked by Anonymous on January 6th, 2018.
January 10th, 2018
Staff Member
Although we have not been able to verify this information, our customers have reported that this is the correct tank for the Supersonic 22.
Asked by Anonymous on February 16th, 2018.
February 16th, 2018
The 9FB2A1C should work but you will need to confirm this by looking at your existing tank to insure compatibility.
Asked by Anonymous on February 20th, 2018.
February 23rd, 2018
Unfortunately we do not have reference materials to determine what tank goes in your amp.
Asked by Jay Thompson on July 29th, 2018.
July 30th, 2018
We are not sure if this is the correct replacement tank for your amp.
Asked by Anonymous on August 22nd, 2018.
August 22nd, 2018
Staff Member
The 4EB3C1B has a long decay time, so finding a reverb tank with a more lush sound may be as simple as replacing a weak or defective tank with a new one. The MOD brand tanks are highly regarded in the industry and you can view the 4EB3C1B at the link below: https://www.amplifiedparts.com/products/reverb-tank-mod-4eb3c1b
Asked by Anonymous on September 4th, 2018.
September 5th, 2018
Staff Member
Yes, this is built with the longest decay time for reverb tanks.
Asked by Anonymous on April 22nd, 2020.
April 22nd, 2020
Staff Member
According to our records, the 4EB3C1B is the correct tank for a Hot Rod Deluxe, not a 4AB3C1B. This is most likely what is causing the issue.
Asked by Anonymous on June 9th, 2020.
June 10th, 2020
Staff Member
The bag helps reduce unwanted noise and feedback, while the cardboard helps to keep the mounting holes lined up properly and also helps some with noise. Technically they aren't required, but it advised that you use them.

## Product Reviews

5.00 out of 5 based on 23 reviews
- November 9th, 2020
5 out of 5

Tank works fine. Heads up, however. On my Princeton Reverb Reissue the stock tank's RCA jacks were color coded exactly reversed from the jacks on the MOD tank. After plugging red into red, white into white the reverb did not work. On closer inspection I discovered that the jacks on the stock accutronic tank were opposite from the jacks on the MOD tank. In other words, red jack on one tank was input, while red on the other tank was output. Don't know what's up with this, or who got what back-ass-wards. Fortunately "input" and "output" are imprinted on the metal housing. Take Away: go by the imprints, not just the colors.

- September 19th, 2020
5 out of 5

I needed to replace the reverb tank in my Fender Princeton '65 Reverb Reissue. Very happy with the MOD tank sound. Much better then the stock tank.

- January 8th, 2020
5 out of 5

I have completed the replacement of the reverb tanks in my fender Twin Custom 15 and fender Super Reverb this date and both sound great with my Gibson SG Standard

- December 24th, 2019
5 out of 5

I purxhased this to repair my Fender Twin Custom 15 it now has the reverb that it once had and I am very satisfied. I now have to replace the reverb tank in my Fender Super Reverb and I have purchased the tank but have not installed it as of yet.

- August 1st, 2018
5 out of 5

Replaced the stock reverb tank(accutronics) in my 2000 "the Twin" as I felt it sounded worn out. The Mod reverb tank sounds great & has given my amp new life.

- December 1st, 2017
5 out of 5

This tank is a direct replacement for the "Accutronics & Belton 64063" tank in my Fender Super Sonic 22 combo. The stock tank was acting up. This MOD tank sounds much better than the stock tank. It gets pretty surfy wet if you dial it up.

- February 11th, 2017
5 out of 5

Great Reverb tank. I bought it to replace the unit in my new Fender Super Sonic. The Mod I received was exactly what was in my Fender SS. No difference at all. Check your amp before you decide to replace the tank. I thought I was buying an upgrade but it turns out I didn't need it.

- January 18th, 2016
5 out of 5

Better than factory. Very pleased (94 twin)

- January 5th, 2016
5 out of 5

Replaced bad tank in Fender Super Sonic. Now she's right for the first time. Sounds great. Better than factory tank. Now she sings,cries. Price was great. Delivery time was great. Thanks AP. I have my amp back.I give you 5 stars !

- August 14th, 2014
5 out of 5

Bought this to replace a broken accutronics reverb tank that originally came with a recently aquired used Fender Deluxe Reverb Reissue. I have to say that I am extremely satisfied. It has a nice full decay and leans towards the bright side of the spectrum. The decay is nice and smooth without any "echo" type effect. Only time will tell how long it will last but for the price, It's as good as it gets. I would recommend this tank to anyone looking for a bright, smooth, and long decay in their reverb.