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. × 3 in. | ||
| Weight (Packaging) | 1.3118 lbs. | ||
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Product Reviews
Perfect replacement tank for my 1974 Twin Reverb. Reverb sounds 199% better now.
Perfect replacement for my Crate VC50
Every time I buy something from Amplified Parts, I always get exactly what I was hoping for. In this case, the reverb tank went into a Vintage 1965 Super Reverb and it sounds wonderful. There is nothing like a real spring reverb when its working correctly. I will remember to shop Amplified Parts first when I need tubes or restoration parts. Great pricing, guick shipping and, the descriptions are accurate.
Ordered as a replacement for a defective tank in a vintage Lab Series L7 amplifier. Easy fix and works like a charm...beautiful dripping reverb for that authentic surf and early rock n'roll music, or just a hint to musically elevate your tone! No issues with the workmanship. Definitely recommended.
Ordered as a replacement for my Princeton Reverb. Sounds lovely, definitely has the classic Fender character. Only giving four stars because both transducers were loose. Not a huge deal, nothing a drop of superglue couldn’t fix. Would recommend but check the transducers for movement before you install.