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.
| 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. × 2.5 in. | ||
| Weight (Packaging) | 1.2963 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 |
Product Reviews
worked out better than stock.
Mine was loosely shipped in a bigger box with my other items. It failed after about 3 hours use. AES had me ship the defective one back which cost me more than buying one...
Now I have a two week or so wait for another tank to arrive and a customer without reverb in his amp. The tank did sound pretty good while it lasted. I could have bought one locally and will probably have to for this customer.
Everything was really smoothm, thank you, the product arrive perfectly very well packaged and worked without any problem, thank you for a great transaction and a satisfied customer.
Great part, great price
Nice gutteral sound.
The MOD tanks sounds smoother and warmer than my Fender Twin's original (2005) Accutronics tank. AES was fantastic as usual with shipping; careful packaging and a quick delivery!
This tank replaced the noisy original one in my 1971 Fender Vibrolux Reverb. The old one had a very loose spring that constantly chattered and crashed making it unusable. This new MOD unit is well made and installed easily. Mounted on the original backing board, wrapped in thin bubble wrap and enclosed in the vinyl reverb bag, it is well isolated and very quiet. Every tank has it's own sound I've come to know, and this MOD unit has a rather dark tone with slightly rolled off highs, not bright and drippy like some reverbs in other Fender amps. Oh well... nonetheless serviceable and a good sound as it is but not the best I've heard. Thanks AES for helping me get the right tank
Very rich reverb, maybe a bit too rich but hey, who's counting seconds???? You can always turn it down! Very nice! Best alternative since Accutronics went overseas. Great value.
I was refered to this reverb tank as the one to get from an over qualified expert.
Unfortunately, this one does not sound good and the reverb is much too long and not pleasant.
As always I received the order in
A fast , efficient manner ,
Put this Reverb Tank in 67 Pro
Reverb , it sounds "awesome "
Thanks Tubes and More !