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Reverb Tank - Mod® 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
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 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.
SKU:
P-RMOD-4AB3C1B
Item ID:
003293
UPC/EAN:
797734820928
Connector Type:
Decay Time:
Input Impedance:
Mounting Plane:
Number Of Springs:
Output Impedance:
Tank Length:
Type:
RoHS Compliant
| 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 |
My Project Lists
Specifications, Files, and Documents
Sound Samples:
Sound Sample - Drum Machine Clap00:05https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_2-spring_long_drum_machine_clap.mp3
Sound Sample - Drum Machine Snare00:06https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_2-spring_long_drum_machine_snare.mp3
Sound Sample - Quick Strum00:06https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_2-spring_long_quick_strum.mp3
Sound Sample - Stacatto00:07https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_2-spring_long_stacatto.mp3
Sound Sample - Sustained Chord00:08https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_2-spring_long_sustained_chord.mp3
Sound Sample - Tremolo Chords00:09https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_2-spring_long_tremolo_chords.mp3
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Questions and Answers
Click each question to see its answers.
2 answers
Will this sound good in my Twin?
Asked by Anonymous on August 27th, 2015.
August 27th, 2015
Staff MemberTop 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.
Will this work in a 94 Fender Vibroking
1 answers
I have just got a used Fender Sidekick 25 Reverb in working order. Unfortunately the reverb tank is missing.
Can anyone tell which if any modern reverb tank would be a suitable replacement?
The Sidekick is a solid state amp approx 1985 vintage.
Thanks
Asked by Anonymous on November 14th, 2015.
November 17th, 2015
Staff MemberTop 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
1 answers
Hi, I have a Fender 1968 deluxe reverb,AB763,and I am looking for a nice lush reverb. Would this be the one to use?
Asked by Anonymous on November 19th, 2015.
November 20th, 2015
Staff MemberTop 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.
1 answers
I need to buy some tanks for the JCM900 and the JCM2000. Which models of the MOD tanks do I need?
Asked by Anonymous on June 26th, 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.
1 answers
Would it sound any better than the factory tank on a Fender Blues Deluxe reissue?
Asked by Anonymous on 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.
1 answers
I have a Peavey Valveking 112 and would like to upgrade my reverb. I can hardly hear it.
I would love to find a new spring reverb that could be heard better. I bought the amp new 8 years or so. Sounds great with new tubes clean loud, and breakes up when I want it to also loud when I need it. now i'd like a new reverb tank -- Help
Asked by Anonymous on 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.
1 answers
Will this work with no alterations in the current Fender '65 Princeton Reverb amps?
Asked by Anonymous on November 15th, 2016.
Yes, this will work in your '65 Princeton Reverb.
1 answers
What other tank options are there for a '63 reissue fender reverb unit?
Asked by Anonymous on 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.
1 answers
I am looking for a replacement reverb tank for a 1993 Fender Super Amp (op-amp reverb driver). Is the 4AB3C1B an appropriate replacement? Thank you.
Asked by Anonymous on April 4th, 2017.
From our limited research it appears that the 4AB3C1B was the original tank in your amp.
1 answers
I have a Mesa Boogie Nomad 100 and need to replace the reverb tank. Your site states that the MOD 4AB3C1B unit will work on some Boogies. I was trying to get a type 9 unit thinking that it would give me the best reverb for the channel 1 clean. Can you guide me on that? Thanks. Dave Sutton
Asked by Anonymous on April 22nd, 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.
1 answers
Would this tank work in a Sunn SX6350 PA mixer? Thanks!
Asked by Anonymous on 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.
1 answers
Is this an improvement over the stock PRRI reverb tank?
Asked by Anonymous on September 15th, 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.
1 answers
Would this work in my Hot Rod Deluxe?
Asked by Anonymous on October 17th, 2017.
The 4EB3C1B is the proper replacement for your Hot Rod Deluxe.
1 answers
Would this tank be correct for a Fender Supersonic 22?
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.
1 answers
Which tank for my Ampeg 90's 2-12 reverberocket?
Asked by Anonymous on February 16th, 2018.
The 9FB2A1C should work but you will need to confirm this by looking at your existing tank to insure compatibility.
1 answers
Will this work in a Mesa Boogie Recto-Verb 50 combo ?
Asked by Anonymous on February 20th, 2018.
Unfortunately we do not have reference materials to determine what tank goes in your amp.
1 answers
Will this tank work in a Fender Frontman 65R?
Asked by Jay Thompson on July 29th, 2018.
We are not sure if this is the correct replacement tank for your amp.
1 answers
Benim fronman 25 teki tankı çıkarım 4EB3C1B Tktım fakat reverb baya zayıf.
devrede değişiklik yapmam gerekiyor çünkü alıcı kısım zayıf.
neler önerirsiniz sevgiler.
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
1 answers
Is this the longest decay plate for a 60's fender deluxe? Reverb Tank - MOD®, 4AB3C1B
Asked by Anonymous on September 4th, 2018.
September 5th, 2018
Staff Member
Yes, this is built with the longest decay time for reverb tanks.
1 answers
Just installed a mod long delay 3 cone in a hot rod deluxe and reverb knob is maxed out still not enough reverb?
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.
1 answers
My friend has a 72 vibrolux and bought a MOD®, 4AB3C1B, Long Decay, 2-Spring reverb tank and was wondering if it needs a bag. He bought one but is unsure how to mount. He just doesn't want to mess anything up. It belonged to a friend that passed away and he is re-doing the amp. Does it need cardboard and bag or just mount it? Thanks....Troy Hollinshead
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.
1 answers
I have a 1999 Fender Princeton 65 solid state that was missing the reverb tank when purchased. Will this be the correct replacement tank? It’s a 65w 8ohms amp
Asked by Anonymous on November 18th, 2022.
November 21st, 2022
Staff Member
According to our records, the 8EB2C1B tank was used in the Fender Princeton 65. https://www.amplifiedparts.com/products/reverb-tank-mod-8eb2c1b-medium-decay-3-spring
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Product Reviews
Very good Reverb Tank at a good price point
This has got to be the the most intense reverb that I ever heard, in a good way. Much more lush than a 1960's Accutronic tank. I like it.
The reverb tank in my 1980's Dean Markley CD60 died, and since it was an oddball tank made by OC Electronics in Wisconsin, I had no idea what to replace it with. I emailed Mod Reverb and asked for their suggestion. They suggested the 4AB3C1B. I got it and tried it out, works better than the original tank. This one has more reverb intensity to it, can do the surf verb no problem. The old one was pretty tame, even when cranked.
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.
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.
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
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.
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.
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.
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.