Reverb Tank - Mod® 8AB2C1B, Medium Decay, 3-Spring

Mod Electronics
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Reverb Tank - Mod® 8AB2C1B, Medium Decay, 3-Spring

In Stock
  • Replaces: 8AB2C1B
  • Solid, sturdy construction
  • Type: Short (3 Spring) tank
  • Decay: medium decay
  • Input: 10 Ω
  • Output: 2,575 Ω
  • Connectors: Input insulated/output grounded
  • Locking: No lock
  • Mounting: Horizontal/open side down
  • Compatible amps include the original Fender® Super Champ, and Fender® Princeton Reverb II.

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 Timemedium (1.75 to 3.0 s)
Grommet Hole Diameter0.2 in.
Input Impedance10 Ω
Item Height1.5 in.
Item Length9.25 in.
Item Width3.38 in.
Mounting Hole Center to Center A8.56 in.
Mounting Hole Center to Center B2.81 in.
Mounting Planehorizontal, open side down
Output Impedance (Zout)2.575 kΩ
Thickness0.04 in.
Packaging Information
Packaging Dimensions9.25 in. × 3.5 in. × 1.375 in.
Weight (Packaging)0.676 lbs.

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Product Reviews

5.00 out of 5 based on 1 reviews
Tracyohus - January 17th, 2023
5 out of 5

This might get long...

I purchased this MOD tank for my 1987 Roland JC-77 to replace the Accutronics tank that is a direct replacement for the JC-120/JC-77 reverb tank. Long story short, the Accutronics replacement tank for the Roland JC-120/JC-77 does not sound anywhere near as good as the original reverb tank sounded before it failed. So the next option is to relocate the tank from the underside of the chassis to the bottom of the cabinet. To do that you need to de-solder the short send/receive cables from the board and make longer send/receive cables that reach the bottom of the cabinet. That sounds like more of a hassle than it actually is - and it is totally worth it. This tank sounds totally wonderful in a JC-77. It sounds even better than the original tank did before it stopped working.

NOTE: After relocating the tank and confirming that it works in it's new location I went back in and replaced the 10k linear reverb pot in my JC-77 with the 22k linear "Marshall style" pot Amplified Parts sells here. This is also an upgrade well worth doing if you feel your JC-77 does not give you enough reverb. I actually bought the 22k and the 50k linear pots because I wasn't sure which one would work best and give me what I wanted reverb wise. I just new the stock 10k pot does not give me enough reverb. With that said, I tried the 50k pot first. The reverb sounded glorious with the 50k up to 6 on the dial then would fizzle out beyond that. 50k proved to be too much so I took it out and put in the 22k. The 22k linear pot was perfect. Way better reverb than with the original 10k linear pot. However if you do increase that pot value, you will need to relocate the tank or you will get an unacceptable amount of hum in your reverb.