I bought old ROTEL RT-550 tuner cheaply, and decided to try, and upgrade it a little 
I already replaced the all electrolitic capacitors with MKP, and MKS ones, one op njm4558D with OPA2134, and those big capacitors in PSU bypassed with MKT ones. The sound difference now is like heaven and earth , and so i`m thinking to try, and replace some other parts
^__^
There is MPX decoder chip HA12003 16pin DIP but couldn`t find data on it, but found HA12016 which seems to be the newer version of the chip.
HA12016 HITACHI, HA12016 Datasheet
HA12016 pdf, HA12016 description, HA12016 datasheets, HA12016 view ::: ALLDATASHEET :::
But cann`t find out is it pin compatibile, and i hope it`s a drop in replacement.
Does ANYBODY know something about this ???
Grateful in advance
I already replaced the all electrolitic capacitors with MKP, and MKS ones, one op njm4558D with OPA2134, and those big capacitors in PSU bypassed with MKT ones. The sound difference now is like heaven and earth , and so i`m thinking to try, and replace some other parts
There is MPX decoder chip HA12003 16pin DIP but couldn`t find data on it, but found HA12016 which seems to be the newer version of the chip.
HA12016 HITACHI, HA12016 Datasheet
HA12016 pdf, HA12016 description, HA12016 datasheets, HA12016 view ::: ALLDATASHEET :::
But cann`t find out is it pin compatibile, and i hope it`s a drop in replacement.
Does ANYBODY know something about this ???
Grateful in advance