Reverb Tank - Mod® 4AB3C1C, Long Decay, 2-Spring

Mod Electronics
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Reverb Tank - Mod® 4AB3C1C, Long Decay, 2-Spring

In Stock
  • Replaces: 4AB3C1C
  • 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: Vertical/connectors up

Compatible amps include Fender® stand alone reverb and original ’63 Reverb. Also used in Marshall™, and Ampeg™ amps.

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.

Item ID:
Input Impedance:
Number Of Springs:
Output Impedance:
Tank Length:
RoHS Compliant
Product Measurements by Type
Connectorsinput insulated, output grounded
Decay Timelong (2.75 to 4.0 s)
Grommet Hole Diameter0.2 in.
Input Impedance8 Ω
Item Height1.5 in.
Item Length16.75 in.
Item Width4.25 in.
Mounting Hole Center to Center A8.75 in.
Mounting Hole Center to Center B3.75 in.
Mounting Planevertical, connectors up
Output Impedance (Zout)2.25 kΩ
Thickness0.04 in.
Packaging Information
Packaging Dimensions17 in. × 5 in. × 3 in.
Weight (Packaging)1.75 lbs.

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Questions and Answers

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Asked by Anonymous on March 10th, 2016.
March 11th, 2016
Staff Member
Top Contributor
From my research it appears the proper tank for your Peavey Classic 30 is the 4EB2C1B.
Asked by Anonymous on September 13th, 2021.
September 13th, 2021
Staff Member
While we only recommend using reverb tanks as designed, in many cases mounting a tank in a position other than the design specification does not result in noticeable changes but we cannot guarantee this is always the case.

Product Reviews

5.00 out of 5 based on 1 reviews
Doug in El Paso, Texas - December 24th, 2012
5 out of 5

I scratch built a Fender 6G15 stand-alone reverb unit using a Belton-Accutronics (Korean) tank and was underwhelmed with the tone and reverb quality. To me, the tone was rather shrill and brittle, particularly at higher Dwell settings. Following the advice on several forums, I replaced the tank with a 4AB3C1C Mod unit and noticed a significant improvement. The tone is now warmer and much more like that of a vintage tank. IMHO, Accutronics may have the most recognizable "name", but Mod seems to have superior, vintage tone.......and actually costs less (exceedingly rare nowadays).