This Module is currently available.
18dB Low Pass Filter (TB-303 type)
Module A-103 is a voltage controlled low pass filter with 18dB/octave slope. The circuit is based on a modified transistor ladder (Moog ladder) and is a reproduction of the legendary TB-303 filter.
As for the rest the A-103 is identical to the A-120 Moog low pass filter (same controls, inputs/outputs) only the filter sound is different.
The English user's manual is available on the Doepfer web site as pdf file.
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These merchants probably sell this module. Huh?
Doepfer A-103 Vcf6
Doepfer A-103 VCF6 18dB Low Pass Filter
Doepfer A-103 VCF6
Doepfer A-103 VCF6
Doepfer Doepfer A-103 18dB Low Pass