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Reverb Tank - Mod® 9AB3C1B, Long Decay, 3-Spring
- Replaces: 9AB3C1B
- Solid, sturdy construction
- Type: Long (3 Spring) tank
- Decay: long decay
- Input: 10 Ω
- Output: 2,575 Ω
- Connectors: Input insulated/output grounded
- Locking: No lock
- Mounting: Horizontal/open side down
Compatible amps include select Fender®, Hughes & Kettner, Marshall™, Ampeg, Crate, Mesa Boogie, Guytron, Rocktron, DOD, Summit Audio, and Smokey amp models, plus others.
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-9AB3C1B
Item ID:
003309
UPC/EAN:
609722125314
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 | 10 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) | 2.575 kΩ | |
| Springs | 3 | |
| 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 - Staccato | 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_3-spring_long_drum_machine_clap.mp3
Sound Sample - Drum Machine Snare00:06https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_3-spring_long_drum_machine_snare.mp3
Sound Sample - Quick Strum00:06https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_3-spring_long_quick_strum.mp3
Sound Sample - Staccato00:07https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_3-spring_long_staccato.mp3
Sound Sample - Sustained Chord00:08https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_3-spring_long_sustained_chord.mp3
Sound Sample - Tremolo Chords00:09https://www.amplifiedparts.com/sites/default/files/associated_files/mod_reverb_tank_16pt25_3-spring_long_tremolo_chords.mp3
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Questions and Answers
Click each question to see its answers.
2 answers
Will this work on an ac30 cx2
Asked by Anonymous on January 31st, 2018.
Typically the Vox AC30's take a 9EB2C1B.
Yes, it will. It has a longer decay than the 9EB2C1B.
1 answers
Is there a "c" version of this model that would work on a '93 reissue fender reverb unit?
Asked by Anonymous on March 17th, 2017.
If you are referring to the mounting plane then we would not have a 9AB3C1C.
1 answers
Can this unit be mounted vertically?
Asked by Anonymous on March 22nd, 2017.
The mounting plane for this tank would be horizontal open side down.
1 answers
How big is the tank? 6in?
Asked by Anonymous on November 30th, 2017.
The tank in this kit is a 9AB3C1B and is a long tank (16.75").
1 answers
Will this tank work in a Fender Super Sonic 22. Specs are slightly different.
Asked by Anonymous on February 1st, 2018.
The 4AB3C1B and 9AB3C1B are compatible with each other.
1 answers
will this 3 spring work as a replacement for the 2 spring 4AB3C1B? the input and output impendences are slightly different. The 4AB3C1B is 8ohm input and 2250 ohm output.
Asked by Anonymous on April 5th, 2018.
April 6th, 2018
Staff Member
The Input and Output impedance must match in order to be an acceptable replacement.
1 answers
Currently have an 8AB2A1B, will the difference in insulated/grounded ins/outs still work?
Asked by Anonymous on August 17th, 2018.
August 17th, 2018
Staff Member
We wouldn't advise using a tank that has different insulation points and input and output impedances. We do carry a 8AB2A1B in both the MOD and Accutronics brand that you can view here:
MOD Tank
https://www.amplifiedparts.com/products/reverb-tank-mod-8ab2a1b
Accutronics Tank:
https://www.amplifiedparts.com/products/reverb-tank-accutronics-8ab2a1b
1 answers
Will this work in a Hughes and Kettner edition 20th anniversary as a direct replacement? The original tank is STAMER 008-CB3E1E-STA 959006.
Asked by Anonymous on December 11th, 2018.
December 11th, 2018
Staff Member
This appears to be a different tank than the one in question. The most important specs that are required are the input and output impedance. If your amp has a 10 Ohm input and a 2,575 ohm output impedance, this should work for your amp.
1 answers
I'm restoring a mid-60's Benson 300 tube amp and wanted a replacement reverb tank. My technician told me the values were 176-Ohms input and 168-Ohms output. Since none of your tanks had those values I just tried the MOD-9AB3C1B. I could hear it slightly, but the sound level was much lower than the tank I was replacing. Can you help me find something that will work in a 2-, or preferably 3-spring long delay...perhaps a MOD or TAD?
Asked by Anonymous on August 17th, 2019.
August 21st, 2019
Staff Member
There is a schematic online that shows a Hammond IV C. If this is the same as a Gibbs type C, the Accutronics code is 4FB3D1B. Please check the schematic along with your amplifier to confirm.
1 answers
Will this fit a Fender Hot Rod Deluxe?
Asked by Anonymous on January 26th, 2020.
January 27th, 2020
Staff Member
It would physically fit, but the 4BB3C1B and the 4EB3C1B are the designated tanks for the Blues Deluxe and the Blues Deluxe reissue respectively.
1 answers
I've just built a StewMac Fender ’64 Reverb 6G15 Kit that comes with the Accutronics 4AB3C1B Reverb Tank that is rated at Input: 8 Ω and Output: 2,250 Ω. I want to move to the 3-spring tank. This one is Input: 10 Ω Output: 2,575 Ω. Will this tank work in the 6G15 kit? Will the difference in ohms cause any problems?
Asked by Anonymous on April 14th, 2020.
April 14th, 2020
Staff Member
The difference in impedance ratings between the two tanks is close enough to use without concern of damaging the unit in any way.
1 answers
Can this 9AB3C1B tank replace a 9AB2C1B in an amp without damaging or harming something?
Asked by Anonymous on June 18th, 2021.
June 18th, 2021
Staff Member
Absolutely. The character in question only refers to the decay length, 2 being medium while 3 indicates a long decay, so the 9AB3C1B will be the exact same specs as the tank currently in your amp, but will provide a longer decay rate.
1 answers
I have a 1969 Fender Pro Reverb amp. The old reverb pan is pretty tired and short, metallic sounding. I would like to put in a 3 spring tank for more lush, diffuse reverb as opposed to the drippy, bouncy 2 spring thing. Is this the unit I should order?
Asked by Anonymous on June 30th, 2021.
June 30th, 2021
Staff Member
This is an appropriate replacement for a 4AB3C1B tank, that is used in Fender amplifiers from that era, so this should work. You will want to verify that your amp currently uses a 4AB3C1B tank, and if it does, this will certainly work as a replacement.
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Product Reviews
The MOD long decay, 3-spring made a big difference in the quality of my sound. My tech friend, Paul, and I have been restoring / renovating a mid-60s Benson 300 tube amp. Paul had to replace the original reverb transformer ( it was an Audio Interstage Transformer with very high impedance ) with an 8-Ohm Fender transformer in order to give me more options in different reverb tanks. I also tried the MOD long-decay, 2-spring model but I was buried in reverb that wasn't very usable, in my opinion. The 3-spring model really cleaned-up the overall sound and had much more clarity. I'm also going to compare it with the MOD medium-decay, 3-spring model which is currently on order. Great quality MODs!
I've had a Limited edition (12 inch alnico speaker) '65 Princeton Reverb re-issue for about a year, and, though I really love the tone of the amp, I never wanted to add any more than a tiny bit of reverb because the factory unit had an irritating flutter. I replaced the original 2-spring short decay tank with this 3-spring long decay unit and the improvement was dramatic - a smoother, fuller sound. The swap was easy, but I did notice that the color code on the input and output connectors was different from the original, so make sure you connect your new tank using the in and out labels as your guide. Thank you, Amplified Parts, for having such an informative web site.
Good sound. better than Accutronics.
I attached it. tube spring reverb(guyatone FR-3000V)
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