Tascam Porta one R/P AMPL PCB 52101528-04 52101528-03 AN6291 Dbx
Tascam started to shrink their units down from the old Portastudio 144 machines and as a result cut the board down about 50%
this is from a working unit, but contains a wealth of parts noted is 3 of the Panasonic AN6291 dbx chips these are about 6-8 pounds each if you can find them and are used
in many machines not just Tascams.
Nice 60khz oscillator block , compression trimmers and quite a few op amps etc, it seems most of the connections are via molex connectors so its an easy board to change.
Now seen an 003 version