Reverb Tank - Accutronics, 4AB3C1B, Long Decay, 2-Spring
The industry standard for years, the Type 4 is still manufactured today using Hammond’s original design. Counter wound and coupled springs deliver superior mechanical performance and the classic sound that helped make the Fender Twin Reverb Amps famous.
- 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.
New production Accutronics tank.
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) | ||
| Input Impedance | 8 Ω | ||
| Mounting Plane | horizontal, open side down | ||
| Output Impedance (Zout) | 2.25 kΩ | ||
| Springs | 2 | ||
| Packaging Dimensions | 17 in. × 5 in. × 2.5 in. | ||
| Weight (Packaging) | 1.3118 lbs. | ||
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Product Reviews
Excellent quality and perfect sound,4 second decay time accurate and slight treble increase as expected from long-spring tanks.Replaced MOD tank that was self-oscillating due to the second spring vibrating continuously.Worth the few extra bucks,Accutronics is the classic long-spring reverb sound.
The first tank I received wouldn't work, but Antique Electronic Supply took good care of me. They immediately authorized my return and promptly shipped a replacement at no cost to me. Now the reverb on my Fender Super Reverb amp works great. I'm very happy with the product and with the customer service.
Bought this for a 1968 Fender Twin. Sounds just like the original as far as I can tell. I am happy and that is good.
Great improvement over the original design with the connectorized transducer coils. This has always been a weak point in their reverb tanks and these connections get broken easily and often. I think Accutronics put that potential problem behind them. A better than exact replacement.
The reverb is a reverb unit. It's great. Only took a few days for my order to arrive from Arizona to Portland Oregon. I am very happy with my purchasing experience. Thank you.