By combining an analog multimode filter and a spring reverb amplifier, the AS-2 Analog Spring reverb will get you the unique spring reverb sound that you are looking for.
Mounted in a 19inch rack, the multimode filter lets you shape the input signal in various ways, low pass, band pass and high pass, while the center frequency is either controlled manually, by the internal LFO oscillator or by the input signal envelope . Then the reverb tank amplifier circuit will  get you the magic sound of spring reverb.

The standard version of this unit include an outboard reverb tank connected through an RCA. The RCA and AC power cables are also included.
Inboard mounted tank reverb and wooden engraved front panel, can be made on demand, please, get in touch with the Jungletronics Audio team. In case of an inboard mounted reverb tank, a special care is given by shielding the tank from electromagnetic fields inside the unit.