Tascam System 20 modular mixer [View all]

Hello! I’m hoping someone on this board has knowledge of or experience with this modular audio mixer manufactured by Tascam (Teac) in the 1980s.

The components of the System 20 are as follows:
MM-20 - main mixer module having 2 XLR mic inputs and 4 RCA line inputs
EX-20 - expansion module adding 4 additional XLR mic inputs
MU-20 - meter bridge module having 4 very nice large illuminated analog level meters

There was another available module, the PE-20, which is an equalizer, but I don’t have that module.

This set differs from any mixer I have used in that the signal path is set up using jumper cables rather than by buttons or switches. This should yield a tremendous number of options for processing signals.

I received this in a trade quite some time ago and have never used it. It came with no manual or other documentation, and the signal routing is not intuitive to me, so I can’t really even fully test its capabilities. I have found no user manual available online.

Does anyone have experience with this or a similar mixer? Any information or leads toward obtaining a manual would be appreciated!