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
Replaced a working, great sounding vintage 1968 tank. The new sounds like the old one!
Full size reverb tank with plenty of "Splash."
Made my Allen amp sound like it should!
Needed to replace a reverb pan in a Princeton and decided to go with the Accutronics instead of the MOD. Very happy with the results; it sounds vintage and full.
I replaced the original Accutronics reverb tank in my 1967 Princeton Reverb with this one. Although the original tank still worked and tested within spec, it was noisy and weak even with new cables, tubes, full recap, etc. (I actually did a full restore on this amp). I was reluctant to replace the original tank, but decided that for the price of this one it was worth a try. And I'm now very glad that I did. What a difference!! This tank sings with sparkle and warmth with lots of usable depth, as it should in an old PR circuit. It's also very quiet even with a 12ax7 driver. I was also pleasantly surprised that the mounting holes were cut exactly the same as the original and able to re-use the plywood base the original was on without making new holes in it. Not a big deal, but just to the point that it's a direct replacement detail in addition to the tech specs that I appreciate. Note, it did not come wth any mounting hardware which can be minus for some (I re-used the screws I had from the original). It does seem to be well made but time will tell if it can withstand the rigors of gigging and getting knocked around like my old tank. But for now, I'm giving it 5 stars for its sound and direct replacement compatibility in my old PR.
Excellent, works as it is supposed to and sounds like it is supposed to. Happy
Excellent! the shipping was fast and as scheduled. The tank I installed in my 1965 vintage Princeton reverb and worked perfect! I also ordered the bag and fitted tight but right!
Excellent! the shipping was fast and as scheduled. The tank I installed in my 1965 vintage Princeton reverb and worked perfect! I also ordered the bag and fitted tight but right!
Excellent! the shipping was fast and as scheduled. The tank I installed in my 1965 vintage Princeton reverb and worked perfect! I also ordered the bag and fitted tight but right!
Excellent! the shipping was fast and as scheduled. The tank I installed in my 1965 vintage Princeton reverb and worked perfect! I also ordered the bag and fitted tight but right!