[sdiy] RC-4558 and equivelants

[Hallvard Tangeraas]

I'm trying to find out what's wrong with the ETI vocoder input amp PCB
and schematic, but can't seem to find the data-sheet for an IC used
named RC-4558.
I do however have the pinouts and data available for the "MJM 4558"
(Maplin catalogue) and "MC 4558" (Elfa catalogue) .

Are they all the same chip?


Hallvard
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