5 out of 5
Mod Electronics P-RMOD-4BB3C1D Reverb Tank - MOD®, 4BB3C1D, Long Decay, 2-Spring
* Click "Add to Cart" to calculate shipping and delivery time.
Product Description
Manufacturer Part Number: P-RMOD-4BB3C1D
Compatible amps include Marshall™ DSL60, TSL60, DSL100, TSL100, DSL201, DSL401, TSL122.
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.
Measurements and Specs
Files
Compatible amps include Marshall™ DSL60, TSL60, DSL100, TSL100, DSL201, DSL401, TSL122.
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.
Measurements and Specs
| Connectors | input insulated, output grounded | |
| Decay Time | long (2.75 to 4.0 s) | |
| Grommet Hole Diameter | 0.2 in. | |
| Input Impedance | 150 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 | vertical, connectors 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. |
Files
| 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 |
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Note
This product is not eligible for coupon code discount, for we've been offering the best price in the market.
Need more information?
Our staff are available to answer any questions you may have about this item
Our staff are available to answer any questions you may have about this item
Customer Reviews
By kly411
Date: December 02, 2025
Maybe quality is hit and miss but I was expecting this to be an upgrade to the stock tank on a blues jr 4. It isn't. The volume is absurdly low. You can perceive some reverb if turned near all the way up but even then it is faint, not subtle like the stock tank which will be going back in, but faint.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By A Customer
Date: November 11, 2025
Ordered this tank for a Fender Princeton guitar amp. Easy to mount. Sounds fantastic! A nice lush reverb that's much better than the stock reverb tank. Highly recommend!
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Matt Alcott
Date: July 15, 2025
no issues
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Christopher C
Date: June 29, 2025
Drop in fit for my Stage Right tube amp. A marked improvement over the stock factory reverb tank. I used to turn up the reverb to the max with minimal effect now with this 3 spring reverb tank I can turn it a little to hear a difference.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Blake M.
Date: April 22, 2025
Huge improvement over the stock tank.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Leo
Date: February 02, 2025
The original reverb tank in my Peavey Backstage amp (the 20W version and not Backstage Plus) was the OC Electronics Type-247. It worked well, but I was looking for more "drip". After some research, I purchased the Mod Reverb Tank (8EB2C1B) because it fit current specs and was budget friendly. Swapping out the old Peavy tank for the newer Mod tank took all of 5 minutes. I did run some tests between the two and found the Mod tank has more "drip", but not dramatically different. If I had to rate the "drippiness" on a scale from 1 to 10 (with 10 being the drippiest): - The original Peavey reverb tank = 6.5 - The new Mod reverb tank = 8
Rating: 
[4 of 5 Stars!]
[4 of 5 Stars!]